When installing an extension with BE modules through the new
extension manager, the left frame with modules is not
refreshed. An accordant call to the module menu widget needs
to be triggered in those cases.

Change-Id: Ibead3b1a0da99be300c16ae3237986387294a74f
Releases: 6.0
Fixes: #42009
Reviewed-on: http://review.typo3.org/16129
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn