changed to use adst for D63_PRED

To be consistent with other prediciton modes

Change-Id: If9e1464e5c807f0b36047a046c4ac59d91b1b868

vp9/common/vp9_blockd.h

diff --git a/vp9/common/vp9_blockd.h b/vp9/common/vp9_blockd.h
index a8b563c..c5cfb5e 100644
--- a/vp9/common/vp9_blockd.h
+++ b/vp9/common/vp9_blockd.h
@@ -612,6 +612,7 @@
 
     case B_V_PRED :
     case B_D117_PRED :
+    case B_D63_PRED:
       return ADST_DCT;
 
     case B_H_PRED :