Change the default widget style on Windows
Change the default widget style on Windows

The default seems to have changed, as reported in #1502, this changes it
to Windows Vista which looks better to me. There are other possible
options too.

mathturtle/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,mathturtle/tomviz,mathturtle/tomviz