[BUGFIX] Keep search word on switching search mode

The search word is now properly kept on
switching between advanced and normal
search mode in EXT:indexed_search.

Resolves: #103633
Releases: main, 12.4
Change-Id: Ic694e40da3a7bdeee3d76be2402fd4bf8e150e3c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83792


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>