Fixup format selection fallbacks

[RichLogan]

Ensure that camera formats fallback correctly when requests cannot be fulfilled exactly. The logic currently here is that a request for a higher resolution will always go through if possible, but a request for a higher frame rate that would lower resolution will not (e.g If you request 1080p60 and 4k30 you'll get 4k30).

If no exact match format can be found we do nothing. If there was never any match, you'll just be in the camera's default format.

[GhostofCookie]

I think this looks good, though I wonder if there is a shorter way in swift that we could check for our ideal format parameters, and pick the one that matches the most params.