[BUGFIX] Search also additional file metadata fields

This patch removes the searchFields definition of sys_file_metadata so
the SearchableSchemaFieldsCollector can also take the additional
metadata fields created by EXT:filemetadata into account.

Resolves: #106966
Releases: main, 13.4
Change-Id: I6a568eb5caf66d0a6d92c5c557ff69dd9a249ece
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/89872
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oli Bartsch <bo@cedev.de>
Reviewed-by: Oli Bartsch <bo@cedev.de>

Author: Hawkeye1909

typo3/sysext/core/Configuration/TCA/sys_file_metadata.php

@@ -21,7 +21,6 @@
             'ignoreWebMountRestriction' => true,
             'ignoreRootLevelRestriction' => true,
         ],
-        'searchFields' => 'title,description,alternative',
     ],
     'columns' => [
         'crdate' => [