[gnome-control-center] window: Fix a typo in a comment

[Robert Ancell <rancell src gnome org>]

commit 611ffdbe7d21277011bc77daf33d3b42a5b15a01
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Fri Mar 6 09:18:03 2020 +0100

    window: Fix a typo in a comment

 shell/cc-window.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/shell/cc-window.c b/shell/cc-window.c
index e84864e75..d16d55548 100644
--- a/shell/cc-window.c
+++ b/shell/cc-window.c
@@ -200,8 +200,8 @@ activate_panel (CcWindow          *self,
 
   sidebar_widget = cc_panel_get_sidebar_widget (CC_PANEL (self->current_panel));
   cc_panel_list_add_sidebar_widget (self->panel_list, sidebar_widget);
-  /* Ensure we show the panel when when the leaflet is folded and a sidebar
-   * widget's row is activated.
+  /* Ensure we show the panel when the leaflet is folded and a sidebar widget's
+   * row is activated.
    */
   g_signal_connect_object (self->current_panel, "sidebar-activated", G_CALLBACK (on_sidebar_activated_cb), 
self, G_CONNECT_SWAPPED);