vo: fix disabling/enabling smoothmotion at runtime

vo.c queried the VO at initialization whether it wants to be updated on
every display frame, or every video frame. If the smoothmotion option
was changed at runtime, the rendering mode in vo.c wasn't updated.

Just let vo_opengl set the mode directly. Abuse the existing
vo_set_flip_queue_offset() function for this.

Also add a comment suggesting the use of --display-fps to the manpage,
which doesn't have anything to do with the rest of this commit, but is
important to make smoothmotion run well.

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