[BUGFIX] Evaluator in JS fails with namespaces

If you add an own evaluator, you have to insert the
class inclusive namespaces. JavaScript in TYPO3
backend fails to use the correct class set in
namespaces.

Resolves: #52904
Releases: 6.2,6.1,6.0
Change-Id: I356a2a7ff169462307506c64234741e6a690f8e2
Reviewed-on: https://review.typo3.org/25317
Reviewed-by: Markus Klein
Tested-by: Markus Klein