[gtk] testscrolledwindow: GtkMenuButton != GtkContainer

[Daniel Boles <dboles src gnome org>]

commit 037454d9049205503aa1d2d48416b6be444c909d
Author: Daniel Boles <dboles src gmail com>
Date:   Tue May 21 21:19:40 2019 +0100

    testscrolledwindow: GtkMenuButton != GtkContainer
    
    It's not anymore, so don't cast it to one... Use the new :label instead.

 tests/testscrolledwindow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tests/testscrolledwindow.c b/tests/testscrolledwindow.c
index 530dd0b1a9..4bfbbcd8e7 100644
--- a/tests/testscrolledwindow.c
+++ b/tests/testscrolledwindow.c
@@ -217,7 +217,7 @@ scrollable_policy (void)
 
   widget = gtk_menu_button_new ();
   gtk_menu_button_set_popover (GTK_MENU_BUTTON (widget), popover);
-  gtk_container_add (GTK_CONTAINER (widget), gtk_label_new ("Popover"));
+  gtk_menu_button_set_label (GTK_MENU_BUTTON (widget), "Popover");
   gtk_container_add (GTK_CONTAINER (cntl), widget);
 
   vbox = gtk_box_new (GTK_ORIENTATION_VERTICAL, 6);