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nusb/cam: take max payload transfer size into account when selecting for bandwidth

This fixed frames (usually) filled with green color because
of the wrong alt settings used before.

--- a/sys/src/cmd/nusb/cam/video.c

+++ b/sys/src/cmd/nusb/cam/video.c

@@ -213,7 +213,7 @@

 		if(ep->iface->id != c->iface->id)

 			continue;

 		bw1 = ep->maxpkt * ep->ntds * 8 * 1000 * 8;

-		if(bw1 >= bw) {

+		if(bw1 >= bw && GET4(c->pc.dwMaxPayloadTransferSize) <= ep->maxpkt*ep->ntds) {

 			if(mink == nil || bw1 < minbw){

 				mink = ep;

 				minbw = bw1;