[BUGFIX] Path to feedit edit action is wrong

Upon clicking the feedit edit pencil icon in frontend, the redirect
URL contains two times typo3, what leads to a wrong call to the frontend

Change-Id: I88e2584cc0dff4be6562dbda64d723e9d9bea1d0
Resolves: #66279
Relates: #66052
Releases: master
Reviewed-on: http://review.typo3.org/38490


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Tested-by: Andreas Fernandez <andreas.fernandez@aspedia.de>