[BUGFIX] Indexed search broken due to wrong namespace in template

An oldschool namespace usage broke the indexed_search module
after moving all ClassAlias files.

Resolves: #63059
Releases: master
Change-Id: I8b5fd48ce4a3345db2ce55a2af59120b55eaaee0
Reviewed-on: http://review.typo3.org/34326
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>