lazycat-daemon/host-list.scm: Fix some bugs.

* lazycat-daemon/host-list.scm (host-list-rem-host): Fix wrong
  call to `host-list-rem-host' and `host-list-get-host-by-id'.
  (get-group-by-host-id): Fix wrong call to
  `host-list-get-host-by-id'.
  (host-list-get-group-name-by-host-id): Fix wrong call to
  `get-group-by-host-id'.
  (get-group-by-host-id): Fix wrong call to
  `host-list-get-host-by-id'.