valve: disconnected mode not in new valve firmware

[okke-formsma]

In the old firmware, the disconnected mode was included.

https://github.com/Flamingo-tech/Open-AIR/blob/main/Open%20AIR%20Valve/Software/OLD%20YAML/open-air-valve_V1.0.3.yaml

script: !include disconnected-mode.yaml
  # !include disconnected-mode-with-humidity.yaml

This script is not included in the new version of the valve software (1.2.0) (https://github.com/Flamingo-tech/Open-AIR/blob/main/Open%20AIR%20Valve/Software/Open_AIR_Valve_1_DIS_V1.2.0.yaml)