Code review comment for lp:~3v1n0/unity/hud-padding-fixes

I'm OK with these changes. I was talking with Thomi about the tests. While it is desirable to have some AP tests around the layout, which we should be able to do relatively easily, I don't want to change the goal posts during the last four weeks of the cycle, so this can land without tests due to the visual nature of the change.

In the future (i.e. next cycle), I expect that we'll start to add some AP tests around layout.