[gnome-games] titlebar-box: Fix GtkBuilder.add_child()

[Alexander Mikhaylenko <alexm src gnome org>]

commit f896890fbc86dcc1b643ca31afeb82c17416b769
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sun Jul 19 03:28:20 2020 +0500

    titlebar-box: Fix GtkBuilder.add_child()
    
    Amazing.

 src/ui/titlebar-box.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/ui/titlebar-box.vala b/src/ui/titlebar-box.vala
index 26ba8621..95d5f6be 100644
--- a/src/ui/titlebar-box.vala
+++ b/src/ui/titlebar-box.vala
@@ -265,6 +265,6 @@ private class Games.TitlebarBox : Gtk.Container, Gtk.Buildable {
                if (type == "titlebar")
                        titlebar = widget;
                else
-                       content = content;
+                       content = widget;
        }
 }