Prioritize non-deactivated users in search results

When a search matches a name, we show suggestion for dm:, sender: and dm-including: searches. We should rank all suggestions for names of deactivated users below all suggestions for names of non-deactivated users. So, e.g.,

dm: User A sender: User A dm-including: User A dm: User B (deactivated) sender: User B (deactivated) dm-including: User B (deactivated)