Fix type of trips property
Fix type of trips property

detected via

  examples/trip-query.py:95: Warning: g_value_get_pointer: assertion 'G_VALUE_HOLDS_POINTER (value)' failed
    msg = ' - CANCELED' if trip.props.status == Lpf.TripStatusFlags.CANCELED else ''

on Debian Jessie.

agx/libplanfahr,agx/libplanfahr