[TASK] Add a "save and close" button in the extensionmanager

Resolves: #59812
Releases: 6.3, 6.2
Change-Id: I3ccfbdd496af2fca9a72d2675393537eafffd075
Reviewed-on: http://review.typo3.org/31766
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>