shell: Remove extraneous gtk_window_set_title() call

As the window title doesn't change anymore.

shell/cc-window.c

@@ -263,7 +263,6 @@ shell_show_overview_page (CcWindow *self)
 
   /* reset window title and icon */
   gtk_window_set_role (GTK_WINDOW (self), NULL);
-  gtk_window_set_title (GTK_WINDOW (self), _(DEFAULT_WINDOW_TITLE));
   gd_header_bar_set_title (GD_HEADER_BAR (priv->header), NULL);
   gtk_window_set_default_icon_name (DEFAULT_WINDOW_ICON_NAME);
   gtk_window_set_icon_name (GTK_WINDOW (self), DEFAULT_WINDOW_ICON_NAME);