Allow folding in sub-inspectors in Array and Dictionary editors

(cherry picked from commit 4e469886e803793c9c2dc7d402da8e9cf98343f9)

editor/editor_properties_array_dict.cpp

@@ -373,6 +373,7 @@ void EditorPropertyArray::update_property() {
 			prop->set_object_and_property(object.ptr(), prop_name);
 			prop->set_label(itos(i + offset));
 			prop->set_selectable(false);
+			prop->set_use_folding(is_using_folding());
 			prop->connect("property_changed", this, "_property_changed");
 			prop->connect("object_id_selected", this, "_object_id_selected");
 			prop->set_h_size_flags(SIZE_EXPAND_FILL);
@@ -1007,6 +1008,7 @@ void EditorPropertyDictionary::update_property() {
 					} else {
 						EditorPropertyResource *editor = memnew(EditorPropertyResource);
 						editor->setup(object.ptr(), prop_name, "Resource");
+						editor->set_use_folding(is_using_folding());
 						prop = editor;
 					}