Vcs: Pass EditorWidgetCreator as copy to factory

This is an attempt to solve QTCREATORBUG-13218.
This should not be needed.

Change-Id: Icc41d83cb051ace11708645e5de18eae70746122
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Reviewed-by: David Schulz <david.schulz@digia.com>