ColorAssets don't update inside of a ButtonStyle

[edonv]

trafficstars

I haven't tested other types of SwiftTheming's asset types, but ColorAssets used inside custom ButtonStyles don't change when the theme is updated. That might honestly be intended, because maybe I shouldn't be putting colors directly into ButtonStyles. Either way, I figured I'd make it known. If this is expected behavior, feel free to close.

[dscyrescotti]

@edonv Good finding! Thank you for raising it here. Ideally, it should update inside ButtonStyle as well. I will take a look into this issue.