ENH: Simplify qMRMLUtils::qImageToVtkImageData using vtkQImageToImageSource.

Fixes #1263

From: Christopher Mullins <christopher.mullins@kitware.com>

git-svn-id: http://svn.slicer.org/Slicer4/trunk@23175 3bd1e089-480b-0410-8dfb-8563597acbee