[BUGFIX] Use correct runtime cache identifier for locked records

The runtime cache was re-built wrong by using
a custom identifer, thus being called EVERY time a
record is checked. This puts the pagetree DB queries in half.

A simple check (like done previously with $GLOBALS['LOCKED_RECORDS'])
to a simple identifier solves this issue.

Related: #79345
Resolves: #83068
Releases: master, 8.7
Change-Id: Id422fbc81b145db3559c194774334692863b4699
Reviewed-on: https://review.typo3.org/54726


Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>