[BUGFIX] RTE wraps p tags around ol/ul in chrome and opera

This is a follow-up to change https://review.typo3.org/#/c/33655/

Resolves: #62559
Resolves: #59559
Resolves: #52470
Releases: master, 6.2
Change-Id: I66c1ed5cf288cd8aaaac66fc12655c655ac1964c
Reviewed-on: http://review.typo3.org/33773
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>