avcodec/amrwbdec: update .p.sample_fmts to planar variant

libavcodec/amrwbdec.c

@@ -1304,6 +1304,6 @@ const FFCodec ff_amrwb_decoder = {
     .init           = amrwb_decode_init,
     FF_CODEC_DECODE_CB(amrwb_decode_frame),
     .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
-    .p.sample_fmts  = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
+    .p.sample_fmts  = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
                                                      AV_SAMPLE_FMT_NONE },
 };