fix: enable onOffCountdown for TS011F_with_threshold

[petrkalos]

I have 2 _TZ3000_cayepv1a and countdown feature is working properly so enabling it for everyone.

• If the state is off and set the countdown it will power on with a specific delay
• If the state is on and set the countdown it will power off with a specific delay

Unfortunately I don't own any of the other devices and I am not sure if they support this feature.

This is my first PR here so please let know if there are any other testing steps I should be making.

[Koenkk]

Thanks!

[puttemanp]

Could this also be implemented for _TZ3000_uwkja6z1
This is a Nous A4Z dual power plug wich should support this function according to the Z2M device page. However it's not exposed.

[petrkalos]

@puttemanp you should be able to add the same statement onOffCountdown: true, here and submit a pull request.

I'd strongly suggest testing it first though.
The way I did was the following

• Get a shell in the z2q container docker exec -it z2q /bin/sh
• Edit the tuya.js file (be careful this is a compiled js file, not the original ts so it should be around line 11316) and add the onOffCountdown parameter
• Exit the container
• Commit the change docker commit z2q koenkk/zigbee2mqtt:2.1.3_custom
• Restart z2q container but now create it from your newly created tag 2.1.3_custom
• You should now be able to see the entities and test them.

Perhaps @Koenkk knows a better way to test this.