revert the change to the sed command in webmin (#1439)

Co-authored-by: Daniel Hansson <github@hanssonit.se>

apps/webmin.sh

@@ -66,7 +66,8 @@ print_text_in_color "$ICyan" "Configuring Webmin..."
 # redirect access on http to https
 check_command systemctl stop webmin
 ## TODO: This will cause Webmin to redirect to the hostname 'nextcloud' and not the IP address if on LAN
-check_command sed -i "s|ssl_redirect=.*|ssl_redirect=1|g" /etc/webmin/miniserv.conf
+check_command sed -i '/^ssl=.*/a ssl_redirect=1' /etc/webmin/miniserv.conf
+check_command sed -i "/^port=.*/a host=$ADDRESS" /etc/webmin/miniserv.conf
 check_command systemctl start webmin
 
 msg_box "Webmin is now installed and can be accessed from this address: