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Changes the N=2 stereo case to use the same sign convention as N=1

--- a/libcelt/bands.c

+++ b/libcelt/bands.c

@@ -751,7 +751,7 @@

       if (N==2 && stereo)

       {

          int c;

-         int sign=1;

+         int sign=0;

          celt_norm *x2, *y2;

          mbits = b-qalloc;

          sbits = 0;

@@ -769,13 +769,13 @@

             if (encode)

             {

                /* Here we only need to encode a sign for the side */

-               sign = x2[0]*y2[1] - x2[1]*y2[0] > 0;

+               sign = x2[0]*y2[1] - x2[1]*y2[0] < 0;

                ec_enc_bits((ec_enc*)ec, sign, 1);

             } else {

                sign = ec_dec_bits((ec_dec*)ec, 1);

             }

          }

-         sign = 2*sign - 1;

+         sign = 1-2*sign;

          quant_band(encode, m, i, x2, NULL, N, mbits, spread, B, intensity, tf_change, lowband, resynth, ec, remaining_bits, LM, lowband_out, NULL, level, seed, gain, lowband_scratch, fill);

          y2[0] = -sign*x2[1];

          y2[1] = sign*x2[0];