[BUGFIX] Fix "Enable tab" for textareas inside inline elements

If a field is configured in the TCA by using
"'defaultExtras' => 'fixed-font : enable-tab'", the textarea
behaves different (pressing the tab produces a tab).

Since inline elements use AJAX, the js method which changes the behaviour
of the textarea needs to be reapplied.

Resolves: #33731
Releases: master, 6.2
Change-Id: Idbab5092f20675c9b912b80299059a8a0d05c3cb
Reviewed-on: http://review.typo3.org/35399
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>