[BUGFIX] Template dropdown doesn't refresh template title after save

Reloads the template menu after the template title has been changed.

Resolves: #51805
Releases: 6.2, 6.1
Change-Id: I5d987a3ffc6a11dfa1ebe54480c9c3b69ccc1959
Reviewed-on: https://review.typo3.org/26766
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind