Cannot add device to a group, when the friendly_name contains a '/'

[sjorge]

Bug Report

What happened

While testing some things for #2122 I noticed when using mqtt to add a device to a group that has a '/' in the friendly_name would be ignored by zigbee2mqtt...

When adding a device to a group that has a '/' in the name, i noticed this does not get picked up at all by zigbee2mqtt.

I was using {"topic":"zigbee2mqtt/bridge/group/bedroom/group_night_light_remote/add","payload":"bedroom/desk_lamp","_msgid":"a75513fb.bcfdc","_event":"node:bfcef621.a616f8"} as payload

What did you expect to happen

The device to be added to the group.

How to reproduce it (minimal and precise)

Have a group named 'test/group' or similar and try and add a device to it using mqtt, it will fail.

additional information

Presumable the mqtt subscription here: https://github.com/Koenkk/zigbee2mqtt/blob/master/lib/extension/groups.js#L31 does not match when a '/' is present in the group name.

Debug Info

zigbee2mqtt version: 1.6.0 (commit #9b67ed5)
CC253X firmware version: {"type":"zStack12","meta":{"transportrev":2,"product":0,"majorrel":2,"minorrel":6,"maintrel":3,"revision":20190425}}

[Koenkk]

Should be fixed in latest dev.

[sjorge]

Looks good.