Fix so Google assistant requestSync on device remove/add

[jonaz]

I had to disable this feature since if the node starts before the server has all the devices it will ask Google to remove all devices and they loose the room config in the cloud.

Possible solution: cache the devices in the server so they survive a reboot. Or cache them in assistant node. Server would probably be a better choice.

If the server is restarted first it will get all the new devices from all running nodes. So perhaps restart order can solve this aswell....