qtdemux: enlarge max atom size to 32MB
For 8K content, frame size is over 25MB, and cause the negotiation failure. enlarge the limitation of QTDEMUX_MAX_ATOM_SIZE to 32MB.
For 8K content, frame size is over 25MB, and cause the negotiation failure. enlarge the limitation of QTDEMUX_MAX_ATOM_SIZE to 32MB.