[BUGFIX] RTE: Table tag left over after cutting table in Firefox

Solution: In case of selecting a table in the status bar, select the
whole node.

Change-Id: Ie68210e49fcf9515cf9233b7495d0c440922debd
Resolves: #29023
Releases: 4.5, 4.6
Reviewed-on: http://review.typo3.org/4380
Reviewed-by: Stanislas Rolland
Tested-by: Stanislas Rolland