mac-telnet: update to latest git - fixes 64bit support

Also remove default password from config to prevent daemon
from auto-starting.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
mac-telnet: update to git head

  * Fixes mac-telnet utilities on 64bit targets
  * Improves discovery reliability on hosts with multiple nics
  * Support dbclient in SSH mode

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>