Fix non flat favorite icons

editor/create_dialog.cpp

@@ -625,6 +625,7 @@ CreateDialog::CreateDialog() {
 	search_box->set_h_size_flags(SIZE_EXPAND_FILL);
 	search_hb->add_child(search_box);
 	favorite = memnew(Button);
+	favorite->set_flat(true);
 	favorite->set_toggle_mode(true);
 	search_hb->add_child(favorite);
 	favorite->connect("pressed", this, "_favorite_toggled");

editor/editor_file_dialog.cpp

@@ -1298,6 +1298,7 @@ EditorFileDialog::EditorFileDialog() {
 	pathhb->add_child(refresh);
 
 	favorite = memnew(ToolButton);
+	favorite->set_flat(true);
 	favorite->set_toggle_mode(true);
 	favorite->connect("toggled", this, "_favorite_toggled");
 	pathhb->add_child(favorite);