[swc-angular-plugin] `styleUrls` is stripped, but not `styles`

[phenomnomnominal]

Looks like the plugin transforms styleUrls rather than processing the styles, that makes sense as a perf optimisation. I think it should also remove any styles defined at the component level, just to behave in a more consistent way. This would also fix the issues I'm seeing because inlined SASS isn't transformed.

I noticed that there might be some changes coming to style handing in #410, but if that is going to be configurable, I think it would still make sense for this behaviour to be consistent.