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Makes stereo savings still less aggressive

Caps the savings at 1 bit per (coded) sample. This doesn't really increase
the bitrate and fixes some issues, e.g. with IgorC's "twilight" sample.

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -1156,6 +1156,7 @@

       coded_stereo_dof = (eBands[coded_stereo_bands]<<LM)-coded_stereo_bands;

       /* Maximum fraction of the bits we can save if the signal is mono. */

       max_frac = DIV32_16(MULT16_16(QCONST16(0.8f, 15), coded_stereo_dof), coded_bins);

+      stereo_saving = MIN16(stereo_saving, QCONST16(1.f, 8));

       /*printf("%d %d %d ", coded_stereo_dof, coded_bins, tot_boost);*/

       target -= (opus_int32)MIN32(MULT16_32_Q15(max_frac,target),

                       SHR32(MULT16_16(stereo_saving-QCONST16(0.1f,8),(coded_stereo_dof<<BITRES)),8));