Always use above predictor in under 8x8 chroma obmc

Change-Id: Ic23c96b78112ef9fbd7adad69f63bdbe3a56ce23

av1/common/reconinter.c

diff --git a/av1/common/reconinter.c b/av1/common/reconinter.c
index eee3458..af6cb1c 100644
--- a/av1/common/reconinter.c
+++ b/av1/common/reconinter.c
@@ -1762,8 +1762,8 @@
     case BLOCK_8X4:
     case BLOCK_4X8: return 1; break;
 #else
-    case BLOCK_4X4: return dir == 1; break;
-    case BLOCK_8X4: return dir == 0; break;
+    case BLOCK_4X4:
+    case BLOCK_8X4:
     case BLOCK_4X8: return dir == 1; break;
 #endif
     default: return 0;