[TASK] Make login_frameset.php dispatched

Use dispatching for login_frameset.php

Resolves: #64774
Releases: master
Change-Id: I1ce9794f3b7a7d66e20bca84464fb9d1cd48c759
Reviewed-on: http://review.typo3.org/36622


Reviewed-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>