[BUGFIX] Bring back inline page title editing

Prevent a race condition in the initialization by registering
a ready-function in case DOM is not ready yet.

Resolves: #68006
Releases: master
Change-Id: I80e9af2f71850ddc2856d76a3865f0b0c5e71adb
Reviewed-on: http://review.typo3.org/41037


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>