[BUGFIX] preparseQuery wrongly computes cache hash of a query

preparseQuery only takes query's parameters to compute its hash but
not the operators used. As such, those two queries result into the
same cache hash:

SELECT * FROM fe_groups WHERE uid = :uid

SELECT * FROM fe_groups WHERE uid IN (:uid)

Fixes: #57173
Releases: 6.2
Change-Id: I6a65ba0be81da73f55c2e6a73f508728567064c3
Reviewed-on: https://review.typo3.org/28656
Reviewed-by: Felix Oertel
Tested-by: Felix Oertel
Reviewed-by: Markus Klein
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe