api: Invert timebase when passing it as a framerate to RCState::new
api: Invert timebase when passing it as a framerate to RCState::new

It's still sketchy, but not 100% broken, now.

Signed-off-by: Derek Buitenhuis <aff7d637ede26ea82e5226e01b697996cc52e526@gmail.com>

xiph/rav1e,xiph/rav1e