def current_mode_string
      n = room.membership_limit
      s = room.open_to_guests? ? "" : "s"
      i = room.locked? ? "i" : ""
      "+#{i}l#{s}"
    end
def current_mode_string
      n = room.membership_limit
      s = room.open_to_guests? ? "" : "s"
      i = room.locked? ? "i" : ""
      "+#{i}l#{s}"
    end
Returns the current mode string