Fix action bar color according to the theme selected.

[tralves]

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Fixes #98.

Even if in the future you remove the nativescript-theme-core (replacing with ns-tailwind? ;) ), right now it is pretty confusing. I just lost an embarrassing amount of time because I picked the theme 'forest' and just assumed that the action bar color was coming from the theme...

Anyway, this is a small fix that I think improves the current template.

[rigor789]

This is something I wanted to do, but haven't gotten around to doing yet. Ideally I'd like to make the theme optional, as for most projects I work on, I don't need it, and there is no easy way to opt-out currently.

What I'm thinking is adding conditions to only add the page and action-bar classes when there is a theme selected. Would you mind working on this, or should I give it a bit more thought and come up with something that should work better?

[tralves]

I can do that. But then we also need to add a none option to the theme, right?

[rigor789]

I can do that. But then we also need to add a none option to the theme, right?

Yes, that would be the plan to be able to select "none" and then no extra classes are added