[BUGFIX] Remove non-needed URL parameter for standard search

Removes parameter to prevent duplicate content, speaking
url problems and overloaded urls.

Resolves: #51189
Releases: 6.3, 6.2, 6.1
Change-Id: I076d2f87ac7a1d0d9d831cf3293d060318750c7d
Reviewed-on: https://review.typo3.org/31420
Reviewed-by: Markus Klein
Tested-by: Markus Klein