vo_opengl: silence vdpau hwdec warnings with smoothmotion

Since the gl_rework merge, this started to print some OpenGL errors when
using vdpau hardware decoding with vo_opengl smoothmotion. This happens
because some hwdec unmap_image call were not paired with a map_image
call. Unlike the old vo_opengl, the new code does not do this out of
convenience (it would be a pain to track this exactly). It was triggered
by smoothmotion, because not every rendered frame has actually a new
input video frame (i.e. no map_image call, but it called unmap_image
anyway).

Solve this by handling unmapping differently in the vdpau code. The next
commit will remove the unmap_image callback completely.

Fixes #1687.

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