Fix a VisualStudio compiler error due to {} initialization

Change-Id: I711fba9638eee23725e5c14b81944e6c04cdc124
diff --git a/av1/encoder/intra_mode_search_utils.h b/av1/encoder/intra_mode_search_utils.h
index 411aa5a..18ab41b 100644
--- a/av1/encoder/intra_mode_search_utils.h
+++ b/av1/encoder/intra_mode_search_utils.h
@@ -86,7 +86,7 @@
   BINS,               // num_inputs
   DIRECTIONAL_MODES,  // num_outputs
   0,                  // num_hidden_layers
-  {},
+  { 0 },
   {
       av1_intra_hog_model_weights,
   },