obs-ffmpeg: Use video_output_info in amf_create_encoder()

The frame rate used to initialize an AMF encoder should be aligned
with the derived frame rate in video_output_info instead of the global
obs_video_info structure. With this change, IDRs can be aligned when
multiple renditions are being encoded.

Using video_output_info members for the format, colorspace, and range
parameters in addition to the frame rate provides a single source for
this information and obs_video_info is no longer needed.
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