Outliner: Do not gray out empty collections

We can still have a special icon for them, but graying out is not the way to go.

source/blender/editors/space_outliner/outliner_tree.c

@@ -1314,10 +1314,7 @@ static void outliner_add_layer_collections_recursive(
 		ten->directdata = lc;
 
 		const bool exclude = (lc->flag & LAYER_COLLECTION_EXCLUDE) != 0;
-		if (exclude ||
-		    ((layer->runtime_flag & VIEW_LAYER_HAS_HIDE) &&
-		     !(lc->runtime_flag & LAYER_COLLECTION_HAS_VISIBLE_OBJECTS)))
-		{
+		if (exclude) {
 			ten->flag |= TE_DISABLED;
 		}