Please fix Zigbee2Mqtt UI deactivation

[lgrawet]

Hi,

There is a problem with frontend (UI) deactivation. The current way by setting an empty port is unsupported and lead to an error.
The correct way to do it is by setting frontend: false, see official documentation here.

Also see my commit be52aa012f15ff8877d90a4946993dfbc166a16f part of PR #25 submitted June 30.

Many thanks,

Laurent

[romanlum]

thanks for your help

fixed in 1.7