[BUGFIX] Remove "Extbase & fluid" suffix from indexed search

The indexed search plugin is Extbase & Fluid only since
TYPO3 v8, and the suffix should be used within the plugin,
as this is a technical detail from the past.

Resolves: #89749
Releases: master
Change-Id: Iaa8d546822da2b444ed81d6c6fc3e497e1e6bb07
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62387


Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>