command: fix video-rotate update when paused

Due to the way video-rotate currently works, the state will be
automatically updated once new video is decoded. So the filter chain
doesn't need to be reinitialized automatically, but there is a need to
trigger the video instant refresh code path instead.

Also move the support function closer to an annoying similar yet
different function. They probably can be unified next time major changes
are done to this code.

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