Themes\Generic.xaml only compiled to .baml for command line builds

[jcansdale]

We've had a strange issue where our Themes\Generic.xaml file was only being compiled to .baml for command line builds. When compiled inside Visual Studio it was being included as a .xaml resource.

See the issue https://github.com/github/VisualStudio/issues/2110.

A proposed fix it so add <ExtrasEnableDefaultResourceItems>false</ExtrasEnableDefaultResourceItems> to the top of our project. See https://github.com/github/VisualStudio/pull/2124.

Does that fix make sense?