avcodec/audiotoolboxenc: Remove AV_CODEC_CAP_DR1

It has been added in 2016 when this flag made no sense for encoders at
all; now that it makes sense, audiotoolboxenc doesn't support it,
despite claiming to do so.

Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/audiotoolboxenc.c

@@ -627,7 +627,7 @@ static const AVOption options[] = {
         .encode2        = ffat_encode, \
         .flush          = ffat_encode_flush, \
         .priv_class     = &ffat_##NAME##_enc_class, \
-        .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY | \
+        .capabilities   = AV_CODEC_CAP_DELAY | \
                           AV_CODEC_CAP_ENCODER_FLUSH __VA_ARGS__, \
         .sample_fmts    = (const enum AVSampleFormat[]) { \
             AV_SAMPLE_FMT_S16, \