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Tuning the folding bands.

The idea here is that it's better to fold a higher band -- even if it was
coded less accurately -- than a lower band that may have a different
temporal structure.

--- a/libcelt/bands.c

+++ b/libcelt/bands.c

@@ -978,8 +978,8 @@

       balance += pulses[i] + tell;

-      /* Update the folding position only as long as we have 2 bit/sample depth */

-      update_lowband = (b>>BITRES)>2*N;

+      /* Update the folding position only as long as we have 1 bit/sample depth */

+      update_lowband = (b>>BITRES)>N;

    }

    RESTORE_STACK;

 }