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Fixes a stereo SILK->CELT switching bug

Making sure not to abruptly "de-collapse" the stereo for such transitions

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -895,7 +895,7 @@

     if (st->mode != MODE_HYBRID || st->stream_channels==1)

-       st->hybrid_stereo_width_Q14 = st->silk_mode.stereoWidth_Q14 = 1<<14;

+       st->silk_mode.stereoWidth_Q14 = 1<<14;

     if( st->channels == 2 ) {

         /* Apply stereo width reduction (at low bitrates) */

         if( st->hybrid_stereo_width_Q14 < (1 << 14) || st->silk_mode.stereoWidth_Q14 < (1 << 14) ) {