fix display of semitrusted repos in status

semitrusted uuids rarely are listed in trust.log, so a special case
is needed to get a list of them. Take the difference of all known uuids
with non-semitrusted uuids.

Command/Status.hs

@@ -102,7 +102,7 @@ supported_remote_types = stat "supported remote types" $
 
 remote_list :: TrustLevel -> String -> Stat
 remote_list level desc = stat n $ lift $ do
-	us <- M.keys <$> uuidMap
+	us <- uuidList
 	rs <- fst <$> trustPartition level us
 	s <- prettyPrintUUIDs n rs
 	return $ if null s then "0" else show (length rs) ++ "\n" ++ init s