[TASK] RTE: Ajust position of resizable handle

Move the resizable handle to the status bar

Releases: master
Resolves: #63567
Change-Id: I634b7e39732a4d1a6eb1fc7545861ad39688c74e
Reviewed-on: http://review.typo3.org/35038
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>