[BUGFIX] Allows setting extended search per default

Makes it possible to enable extended search per default.

Change-Id: I793faa6d7f325661c193bf4661bfd924a6cfb69a
Resolves: #80091
Releases: master,8.7
Reviewed-on: https://review.typo3.org/51925


Reviewed-by: Christian Futterlieb <christian@futterlieb.ch>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>