Address a bug where timing can interfere with madmail getting enabled

app/routes.py

@@ -269,9 +269,9 @@ def step4():
                 setting_value = getattr(form, s).data
                 set_setting(s, setting_value)
             set_setting('first_setup', "false")
-            dump_settings("settings.txt")
             run_madmail_installer()
             db.session.commit()
+            dump_settings("settings.txt")
             return redirect(url_for('setup_complete'))
     if get_setting("first_setup") == "true":
         return render_template('step4.html', form=form, get_setting=get_setting)