[TASK] Cleanup ext:indexed_search web_info module routing

The function menu of info module API method can create
proper link targets without mentioning index.php. The
patch is a preparation for switching the entry point
of info module to mod.php.

Resolves: #55796
Relates: #55672
Change-Id: Ida807864ea8d75a2737313c88d8f89b37bb816b6
Reviewed-on: https://review.typo3.org/27479
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn