Fixed trust icons

* two more trust icons (none, marginal), now showing up like this
** none: 3 gray dots; if no key is found (recipient list only)
** invalid: 1 red dot; if key is invalid (expired)
** untrusted: 2 yellow dots
** marginal: 2 green dots (important for sign-on-first-contact)
** trusted: 3 green dots (if manually signed)
* fixes compose window recipient list icons