[BUGFIX] Add &L=0 to Indexed Search results only when needed.

L=0 is added to Indexed Search results links if current page language is
> 0.

Resolves: #81164
Related: #81994
Related: #81986
Releases: master, 8.7
Change-Id: Ia9738b4d64bdcf1f3b2d6fa91d446f2f22c8130b
Reviewed-on: https://review.typo3.org/53978


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Sascha Rademacher <sascha.rademacher+typo3@gmail.com>
Reviewed-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Tested-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>