Get user uid key from a reliable location

Fixes #113 (Can't reload starred host) by getting the user uid from a working location.

Note that this is really a problem with the issues in #100, Consolidate Host and HostBriefInfo types. I think this quick change is fine for now, but the underlying complexity is the real problem. I didn't look farther, just found that the uid was easily available and used the close available version.