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Use correct bit cost while static-thresh is on

While static-thresh is on, we only need to transmit skip
flag if skip = 1. The cost of skip bit is added to the
total rate cost.

Change-Id: I64e73e482bc297eba22907026298a15fa8cc3920

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -2916,8 +2916,8 @@

                 (sse_v - var_v < thresh_dc || sse_v == var_v)) {

               x->skip = 1;

-              *rate2 = 500;

-              *rate_uv = 0;

+              // The cost of skip bit needs to be added.

+              *rate2 += vp9_cost_bit(vp9_get_pred_prob_mbskip(cm, xd), 1);

               // Scaling factor for SSE from spatial domain to frequency domain

               // is 16. Adjust distortion accordingly.