[BUGFIX] Check extensions in Install Tool broken

Since merging of 64c46b91, TYPO3_LOADED_EXT
is no longer an ArrayAccess but a regular array (like pre 6.2). This leaded
to an error in the Extension Manager important action "Check Extension",
causing an endless loop.

Catchable fatal error: Argument 2 passed to
TYPO3\CMS\Install\Controller\Action\Ajax\ExtensionCompatibilityTester
::loadExtLocalconfForExtension() must implement interface ArrayAccess,
array given

Resolves: #56952
Releases: 6.2
Change-Id: I02e83a8221653d62010952f84c17a8f6f6e185ea
Reviewed-on: https://review.typo3.org/28437
Reviewed-by: Ernesto Baschny
Tested-by: Ernesto Baschny

typo3/sysext/install/Classes/Controller/Action/Ajax/ExtensionCompatibilityTester.php

@@ -138,7 +138,7 @@ class ExtensionCompatibilityTester extends AbstractAjaxAction {
 	 * @param \ArrayAccess $extension
 	 * @return void
 	 */
-	protected function loadExtTablesForExtension($extensionKey, \ArrayAccess $extension) {
+	protected function loadExtTablesForExtension($extensionKey, array $extension) {
 		// In general it is recommended to not rely on it to be globally defined in that
 		// scope, but we can not prohibit this without breaking backwards compatibility
 		global $T3_SERVICES, $T3_VAR, $TYPO3_CONF_VARS;
@@ -164,7 +164,7 @@ class ExtensionCompatibilityTester extends AbstractAjaxAction {
 	 * @param \ArrayAccess $extension
 	 * @return void
 	 */
-	protected function loadExtLocalconfForExtension($extensionKey, \ArrayAccess $extension) {
+	protected function loadExtLocalconfForExtension($extensionKey, array $extension) {
 		// This is the main array meant to be manipulated in the ext_localconf.php files
 		// In general it is recommended to not rely on it to be globally defined in that
 		// scope but to use $GLOBALS['TYPO3_CONF_VARS'] instead.