webrtc sendonly: Add videoscale to avoid webcam compat issues

Part-of: <!18>

webrtc/sendonly/webrtc-unidirectional-h264.c

@@ -212,7 +212,7 @@ create_receiver_entry (SoupWebsocketConnection * connection)
   receiver_entry->pipeline =
       gst_parse_launch ("webrtcbin name=webrtcbin stun-server=stun://"
       STUN_SERVER " "
-      "v4l2src ! videorate ! video/x-raw,width=640,height=360,framerate=15/1 ! videoconvert ! queue max-size-buffers=1 ! x264enc bitrate=600 speed-preset=ultrafast tune=zerolatency key-int-max=15 ! video/x-h264,profile=constrained-baseline ! queue max-size-time=100000000 ! h264parse ! "
+      "v4l2src ! videorate ! videoscale ! video/x-raw,width=640,height=360,framerate=15/1 ! videoconvert ! queue max-size-buffers=1 ! x264enc bitrate=600 speed-preset=ultrafast tune=zerolatency key-int-max=15 ! video/x-h264,profile=constrained-baseline ! queue max-size-time=100000000 ! h264parse ! "
       "rtph264pay config-interval=-1 name=payloader aggregate-mode=zero-latency ! "
       "application/x-rtp,media=video,encoding-name=H264,payload="
       RTP_PAYLOAD_TYPE " ! webrtcbin. ", &error);