[non-normative] Fix PRIMARY_REF_NONE w large_scale_tile

Changes not in Change-Id: Id6319fe5cf9379f81876404cd52899fa2e03f519

Change-Id: I7b574939690dcd2505690fb064710ccc4bc73804
diff --git a/av1/common/entropymode.c b/av1/common/entropymode.c
index eecedde..6da336b 100644
--- a/av1/common/entropymode.c
+++ b/av1/common/entropymode.c
@@ -1179,6 +1179,9 @@
   // default probs, either by av1_setup_past_independence or after manually
   // initializing them
   cm->frame_contexts[FRAME_CONTEXT_DEFAULTS] = *cm->fc;
+  if (cm->large_scale_tile) {
+    for (int i = 0; i < FRAME_CONTEXTS; ++i) cm->frame_contexts[i] = *cm->fc;
+  }
 }
 
 void av1_setup_past_independence(AV1_COMMON *cm) {