scrolledwindow: Don't snapshot junction if we use indicators

The junction doesn't make sense when we use indicators, since the
scrollbars overlap anyway. Not snappshotting it anymore has no visual
effect since it's being drawn below the scrollbars anyway.

gtk/gtkscrolledwindow.c

@@ -2801,7 +2801,8 @@ gtk_scrolled_window_snapshot (GtkWidget   *widget,
   GtkScrolledWindowPrivate *priv = gtk_scrolled_window_get_instance_private (scrolled_window);
 
   if (priv->hscrollbar_visible &&
-      priv->vscrollbar_visible)
+      priv->vscrollbar_visible &&
+      !priv->use_indicators)
     gtk_scrolled_window_snapshot_scrollbars_junction (scrolled_window, snapshot);
 
   GTK_WIDGET_CLASS (gtk_scrolled_window_parent_class)->snapshot (widget, snapshot);