lowercase FRWU string

8556406d (lavc: lowercase the FRWU codec name)
got partially reverted by ec6402b7
(lavc: use designated initialisers for all codecs.)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/frwu.c

@@ -110,7 +110,7 @@ static av_cold int decode_close(AVCodecContext *avctx)
 }
 
 AVCodec ff_frwu_decoder = {
-    .name           = "FRWU",
+    .name           = "frwu",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_FRWU,
     .init           = decode_init,