firewall: Change order of aattributes to make tests happy
firewall: Change order of aattributes to make tests happy

One test checks that `<div id="firewall"` exists.
This was introduced in 9113eb5f.

martinpitt/cockpit,cockpit-project/cockpit,mvollmer/cockpit,garrett/cockpit,garrett/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,martinpitt/cockpit,cockpit-project/cockpit,martinpitt/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,garrett/cockpit,mvollmer/cockpit,garrett/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit