avdevice/decklink_dec: remove AVFMT_RAWPICTURE

It has no effect for input devices.
Signed-off-by: Marton Balint <cus@passwd.hu>

libavdevice/decklink_dec_c.c

@@ -77,7 +77,7 @@ static const AVClass decklink_demuxer_class = {
 AVInputFormat ff_decklink_demuxer = {
     .name           = "decklink",
     .long_name      = NULL_IF_CONFIG_SMALL("Blackmagic DeckLink input"),
-    .flags          = AVFMT_NOFILE | AVFMT_RAWPICTURE,
+    .flags          = AVFMT_NOFILE,
     .priv_class     = &decklink_demuxer_class,
     .priv_data_size = sizeof(struct decklink_cctx),
     .read_header   = ff_decklink_read_header,