[BUGFIX] Update enableDeprecationLog default value and help text

TYPO3's deprecation_log is disabled by default. The Install Tool
shows an incorrect help text for the configuration
$GLOBALS['TYPO3_CONF_VARS']['SYS']['enableDeprecationLog'], claiming
that the default value is "file". In addition, enableDeprecationLog
is set to "file", which should be empty.

The patch removes the value of enableDeprecationLog and removes the
statement about the default value: other values in this area do not
state the default value either and since TYPO3 CMS 6.2 LTS, the
default value depends on the Application Context.

Resolves: #53653
Releases: 6.2
Change-Id: I2061a66b03e1c194f86d346e4183e95d3e959922
Reviewed-on: https://review.typo3.org/25417
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn

typo3/sysext/core/Configuration/DefaultConfiguration.php

@@ -116,7 +116,7 @@ return array(
 		'phpTimeZone' => '',					// String: timezone to force for all date() and mktime() functions. A list of supported values can be found at <a href="http://php.net/manual/en/timezones.php" target="_blank">php.net</a>. If this is not set, a valid fallback will be searched for by PHP (php.ini's <a href="http://www.php.net/manual/en/datetime.configuration.php#ini.date.timezone" target="_blank">date.timezone</a> setting, server defaults, etc); and if no fallback is found, the value of "UTC" is used instead.
 		'systemLog' => '',						// <p>String: semi-colon separated list. Defines one or more logging methods. Possible methods:</p><dl><dt>file,&lt;abs-path-to-file&gt;[,&lt;level&gt;]</dt><dd>logs to a file</dd><dt>mail,&lt;to&gt;[/&lt;from&gt;][,&lt;level&gt;]</dt><dd>sends the log entries via mail</dd><dt>syslog,&lt;facility&gt;,[,&lt;level&gt;]</dt><dd>uses the operating system's log. Facility may be one of LOCAL0..LOCAL7, USER (on Windows USER is the only valid type).</dd><dt>error_log[,,&lt;level&gt;]</dt><dd>uses the PHP error log</dd></dl><p>The &lt;level&gt; is the individual logging level (see <a href="#SYS-systemLogLevel">[SYS][systemLogLevel]</a>).</p>
 		'systemLogLevel' => 0,					// <p>Integer (0, 1, 2, 3, 4): Only messages with same or higher severity are logged.</p><ul><li>0: info</li><li>1: notice</li><li>2: warning</li><li>3: error</li><li>4: fatal error</li></ul>
-		'enableDeprecationLog' => 'file',		// If set, this configuration enables the logging of deprecated methods and functions. The following options are allowed: <dl><dt>String: &quot;file&quot; (or integer &quot;1&quot;)</dt><dd>The log file will be written to typo3conf/deprecation_[hash-value].log</dd><dt>String: &quot;devlog&quot;</dt><dd>The log will be written to the development log</dd><dt>String: &quot;console&quot;<dt><dd>The log will be displayed in the Backend's Debug Console.</dd></dl>Logging options &quot;file&quot;, &quot;devlog&quot; and &quot;console&quot; can be combined by comma-separating them. Default is &quot;file&quot;.
+		'enableDeprecationLog' => '',				// If set, this configuration enables the logging of deprecated methods and functions. The following options are allowed: <dl><dt>String: &quot;file&quot; (or integer &quot;1&quot;)</dt><dd>The log file will be written to typo3conf/deprecation_[hash-value].log</dd><dt>String: &quot;devlog&quot;</dt><dd>The log will be written to the development log</dd><dt>String: &quot;console&quot;<dt><dd>The log will be displayed in the Backend's Debug Console.</dd></dl>Logging options &quot;file&quot;, &quot;devlog&quot; and &quot;console&quot; can be combined by comma-separating them.
 		'maxFileNameLength' => 60,				// Integer: This is the maximum file name length. The value will be taken into account by basic file operations like renaming or creation of files and folders.
 		'UTF8filesystem' => FALSE,				// Boolean: If TRUE then TYPO3 uses utf-8 to store file names. This allows for accented Latin letters as well as any other non-latin characters like Cyrillic and Chinese.
 		'systemLocale' => '',					// String: locale used for certain system related functions, e.g. escaping shell commands. If problems with filenames containing special characters occur, the value of this option is probably wrong. See <a href="http://php.net/manual/en/function.setlocale.php" target="_blank">setlocale()</a>.