Fix an issue in homekit by adding new current_humidity property

[KartoffelToby]

Motivation:

Make Homekit work as expected with HA

Changes:

As for now, we have finally a offical status key for humidity in HA or at least Homekit, so we shoud use it in ha as default,
WARNING breaking change with the current BT UI, need to update at least to version 2.2.2

Related issue (check one):

• fixes Humidity not shown in homekit / Google Home  #1423
• there is no related issue ticket

Checklist (check one):

• I did not change any code (e.g. documentation changes)
• The code change is tested and works locally.

[KartoffelToby]

not needed in favor of #1447