cocoa: fix display refresh rate retrieval on multi monitor setups

1. this basically reverts commit de4c74e5a4a996e8ff431c8f33a32c4b580be203.
even with CVDisplayLinkCreateWithActiveCGDisplays and
CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext we still have to
explicitly set the current display ID, otherwise it will just always
choose the display with the lowest refresh rate. another weird thing is,
we still have to set the display ID another time with
CVDisplayLinkSetCurrentCGDisplay after the link was started. otherwise
the display period is 0 and the fallback will be used.
if we ever use the callback method for something useful it's probably
better to use CVDisplayLinkCreateWithActiveCGDisplays since we will need
to keep the display link around instead of releasing it at the end.
in that case we have to call CVDisplayLinkSetCurrentCGDisplay two times,
once before and once after LinkStart.
2. add windowDidChangeScreen delegate to update the display refresh rate
when mpv is moved to a different screen.

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