[TASK] Cleanup RemoveXSS

Easier to understand variable names and some optimizations of the code.

Resolves: #65893
Releases: master
Change-Id: I4f3b535fba5809fc3fa6ac1b1ccccbec239cc85b
Reviewed-on: http://review.typo3.org/37996


Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Tested-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Reviewed-by: Jan Helke <typo3@helke.de>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>