[BUGFIX] RTE: Change to tab menu div id breaks RTE load in IRRE element

Problem: -DIV suffix to id's of tab div's was removed. This breaks RTE load in
IRRE and other nested elements.
Solution: Adapt RTE script.

Releases: master
Resolves: #62897
Change-Id: I45727c698a57456c93d2700f26151029d4628baa
Reviewed-on: http://review.typo3.org/34033
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>