[BUGFIX] Remove correct indexed_search entries on cache clearing

Just clear potential the page being edited from indexed_search's
index. The previous implementation did also take potential child
pages, into account, but not the page itself.

Resolves: #100877
Releases: main, 12.4, 11.5
Change-Id: I4c8e0c70e68744f629cb1b1c9f62b5f3028502fd
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80090


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan B�rk <stefan@buerk.tech>
Reviewed-by: Stefan B�rk <stefan@buerk.tech>