Subscribe/Unsubscribe icons have three different alignments

[Sequel to bug 383555.)

On the page for a bug report that you are subscribed to, the "Unsubscribe" link has its icon in one position, and the "Subscribe someone else" has its icon in another. Making things worse, the icon next to your name in the subscriber list has its icon in yet a third position.

At the least, all the unsubscribe icons should line up with each other. And since subscribing and unsubscribing never apply to the same row of text in the subscribers list, the list could be even neater if the subscribe and unsubscribe icons were all in the same horizontal position. (In the original Launchpad 2.0 bug page mockup, I had them all on the left.)