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Quality: Forces trim to 5 on hybrid mode

This saves bits and makes more sense since alloc_trim_analysis()
mostly looks at the lower bands that are coded with SILK

--- a/celt/celt_encoder.c

+++ b/celt/celt_encoder.c

@@ -1886,12 +1886,15 @@

    alloc_trim = 5;

    if (tell+(6<<BITRES) <= total_bits - total_boost)

    {

-      if (st->lfe)

+      if (start > 0 || st->lfe)

+      {

+         st->stereo_saving = 0;

          alloc_trim = 5;

-      else

+      } else {

          alloc_trim = alloc_trim_analysis(mode, X, bandLogE,

             end, LM, C, N, &st->analysis, &st->stereo_saving, tf_estimate,

             st->intensity, surround_trim, st->arch);

+      }

       ec_enc_icdf(enc, alloc_trim, trim_icdf, 7);

       tell = ec_tell_frac(enc);

    }