Should update rdcost after the rate change

STATS_CHANGED:
This fix introduced small change of metrics due to the updated rdcost.
See my next cl for the detailed test results.

Change-Id: I9dad370c64e99506c9219cbf2eaf465bfdc92965
diff --git a/av1/encoder/rdopt.c b/av1/encoder/rdopt.c
index 6a069d1..c1afa8c 100644
--- a/av1/encoder/rdopt.c
+++ b/av1/encoder/rdopt.c
@@ -11032,6 +11032,7 @@
                rd_cost->dist);
     // Account for non-skip mode rate in total rd stats
     rd_cost->rate += x->skip_mode_cost[skip_mode_ctx][0];
+    av1_rd_cost_update(x->rdmult, rd_cost);
   }
 
   if (skip_mode_rd_stats.rdcost <= best_intra_inter_mode_cost &&