[BUGFIX] Error 414 - "Request-URI Too Large" when saving file in extension manager (old version)

Due a missing closing " the form has invalid HTML that result in a very long GET request

Change-Id: I0e369dec5cb91845402daaece82b215e7a6f7dd0
Resolves: #M17812
Reviewed-on: http://review.typo3.org/1035


Reviewed-by: Christopher <chrissitopher@gmx.de>
Tested-by: Christopher <chrissitopher@gmx.de>
Reviewed-by: Steffen Kamper <info@sk-typo3.de>