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