[BUGFIX] Fix typo in file search query

Remove superflous quote (").

Resolves: #77751
Releases: master
Change-Id: Ida96f659f049b798a5d07c7aae9b8d9476ea5026
Reviewed-on: https://review.typo3.org/49721


Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>