qtdemux: enlarge the maximal atom size
qtdemux: enlarge the maximal atom size

For 8K content, frame size is over 25MB, and cause the negotiation failure.
Enlarge the limitation of QTDEMUX_MAX_ATOM_SIZE to 32MB.

pexip/gst-plugins-good,pexip/gst-plugins-good,pexip/gst-plugins-good,GStreamer/gst-plugins-good,GStreamer/gst-plugins-good,pexip/gst-plugins-good,GStreamer/gst-plugins-good,pexip/gst-plugins-good,GStreamer/gst-plugins-good