[CLEANUP] Reduce cache gets in MarkerBasedTemplateService

Multiple calls to get() from cache can be condensed to one.

Change-Id: I1d949fcbc0c91afdbfb2d0e2bc3d9c1b4dfd475a
Resolves: #81385
Releases: master, 8.7
Reviewed-on: https://review.typo3.org/52974


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>