Add "devel" CSS class to the window

When building Dictionary using the "devel" profile we should have the
corresponding style class associated to the application windows.

src/gdict-window.c

@@ -1689,6 +1689,12 @@ gdict_window_init (GdictWindow *window)
    */
   window->db_chooser = gdict_database_chooser_button_new ();
   window->strat_chooser = gdict_strategy_chooser_new ();
+
+  if (g_strcmp0 (PROFILE, "stable") != 0)
+    {
+      GtkStyleContext *context = gtk_widget_get_style_context (GTK_WIDGET (window));
+      gtk_style_context_add_class (context, "devel");
+    }
 }
 
 GtkWidget *