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Make the CELT background noise estimator adapt more quickly on DTX update

--- a/celt/celt_decoder.c

+++ b/celt/celt_decoder.c

@@ -1030,10 +1030,18 @@

    /* In case start or end were to change */

    if (!isTransient)

    {

+      opus_val16 max_background_increase;

       OPUS_COPY(oldLogE2, oldLogE, 2*nbEBands);

       OPUS_COPY(oldLogE, oldBandE, 2*nbEBands);

+      /* In normal circumstances, we only allow the noise floor to increase by

+         up to 2.4 dB/second, but when we're in DTX, we allow up to 6 dB

+         increase for each update.*/

+      if (st->loss_count < 10)

+         max_background_increase = M*QCONST16(0.001f,DB_SHIFT);

+      else

+         max_background_increase = QCONST16(1.f,DB_SHIFT);

       for (i=0;i<2*nbEBands;i++)

-         backgroundLogE[i] = MIN16(backgroundLogE[i] + M*QCONST16(0.001f,DB_SHIFT), oldBandE[i]);

+         backgroundLogE[i] = MIN16(backgroundLogE[i] + max_background_increase, oldBandE[i]);

    } else {

       for (i=0;i<2*nbEBands;i++)

          oldLogE[i] = MIN16(oldLogE[i], oldBandE[i]);