[BUGFIX] Remove unnecessary onChange="reload" in site language

Since "free mode" has been introduced in #86762 for site languages, the
previous onChange="reload" mechanism, when a fallbackType was changed,
is now unnecessary and is now removed.

Resolves: #90642
Relates: #86762
Releases: master, 9.5
Change-Id: I8bbf9a224dc47c14e4b4ec06961244b6903fbc69
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63606


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Susanne Moog <look@susi.dev>

typo3/sysext/backend/Configuration/SiteConfiguration/site_language.php

@@ -411,7 +411,6 @@ return [
         'fallbackType' => [
             'label' => 'LLL:EXT:backend/Resources/Private/Language/locallang_siteconfiguration_tca.xlf:site_language.fallbackType',
             'displayCond' => 'FIELD:languageId:>:0',
-            'onChange' => 'reload',
             'config' => [
                 'type' => 'select',
                 'renderType' => 'selectSingle',