Front: Weather box & device in room box are using the same shared variable in unistore but without the same content, and it breaks the dashboard

[Pierre-Gilles]

When using the "device in room" and the "weather" box at the same time, they both store the list of "houses" in the "houses" variable, one with the rooms, and one without the room.

It breaks the list of rooms in the device in room box.

We should stop using global state for that.