VideoFrameProcessor treats BT601 and BT709 as roughly equivalent now, so we
shouldn't be making checks that assume BT709 <-> requires tone-mapping.
Also, the color transfer is a better determinant for tone-mapping than color range, so use just the transfer to determine if tone-mapping is required.
PiperOrigin-RevId: 603083100
(cherry picked from commit cebe6d8ba573c2a636426b18c01837fbec6b00aa)
bfa492bf4f