[BUGFIX] Return correct query part in ContentObjectRenderer::searchWhere

Avoid using a prepared statement to return the final query part.

Resolves: #84022
Releases: master, 8.7
Change-Id: I31c44172221962c1dbb3d97d02f6cfa61449d20a
Reviewed-on: https://review.typo3.org/55914


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Sven Juergens <typo3@blue-side.de>
Tested-by: Sven Juergens <typo3@blue-side.de>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>