Exclude inactive accounts when considering which user to invite

Accounts where the gh_id is -1 are accounts we know are inactive and
should never be invited to own crates

Author: carols10cents

src/models/owner.rs

@@ -72,6 +72,7 @@ impl Owner {
         } else {
             users::table
                 .filter(users::gh_login.eq(name))
+                .filter(users::gh_id.ne(-1))
                 .first(conn)
                 .map(Owner::User)
                 .map_err(|_| cargo_err(&format_args!("could not find user with login `{}`", name)))