Assets: Sort by library name if all else is equal

Previously this would be random, which makes the order in the asset
shelf unpredictable when duplicating an essentials brush asset and
keeping the same name.

source/blender/editors/space_file/filelist.cc

@@ -611,7 +611,12 @@ static int compare_asset_catalog(void *user_data, const void *a1, const void *a2
     }
   }
 
-  return compare_apply_inverted(compare_tiebreaker(entry1, entry2), sort_data);
+  int order = compare_tiebreaker(entry1, entry2);
+  if (!order) {
+    order = BLI_strcasecmp_natural(asset_library1.name().c_str(), asset_library2.name().c_str());
+  }
+
+  return compare_apply_inverted(order, sort_data);
 }
 
 void filelist_sort(FileList *filelist)