BUG: use Slicer system fonts in Scene Views

To bring the Scene Views module into alignment with
the Slicer system fonts, propagate the application
settings fonts to the QWebView used to display the
scene views.

Issue #1299



git-svn-id: http://svn.slicer.org/Slicer4/trunk@23197 3bd1e089-480b-0410-8dfb-8563597acbee