[BUGFIX] Fix resolving of method validators

This is a regression bugfix. During the ClassSchema refactoring
the resolving of method validators broke due to stripping of
beginning dollar signs from tags.

Releases: master
Resolves: #83425
Change-Id: Ida33ade7bc61c0bb926fbf1895612eac9a94d948
Reviewed-on: https://review.typo3.org/55244


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>