call gtk_main_quit in cb_destroy

callbacks.c

@@ -14,6 +14,7 @@
 gboolean
 cb_destroy(GtkWidget* UNUSED(widget), gpointer UNUSED(data))
 {
+  gtk_main_quit();
   return TRUE;
 }
 

shortcuts.c

@@ -502,8 +502,6 @@ sc_quit(girara_session_t* session, girara_argument_t* UNUSED(argument), unsigned
 
   cb_destroy(NULL, NULL);
 
-  gtk_main_quit();
-
   return false;
 }