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Temporal VBR tuning

Applies temporal VBR up to higher bitrates after IgorC reported it being
useful at 64 kb/s for amount=0.1

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -1215,7 +1215,7 @@

    {

       opus_val16 amount;

       opus_val16 tvbr_factor;

-      amount = MULT16_16_Q15(QCONST16(.000006f, 30), IMAX(0, IMIN(42000, 68000-bitrate)));

+      amount = MULT16_16_Q15(QCONST16(.0000031f, 30), IMAX(0, IMIN(32000, 96000-bitrate)));

       tvbr_factor = SHR32(MULT16_16(temporal_vbr, amount), DB_SHIFT);

       target += (opus_int32)MULT16_32_Q15(tvbr_factor, target);

    }