This diff standardizes the wallet refresh interval to 60 seconds rather than the existing different intervals for websocket connection and disconnection events. Note: this is the fallback interval, as websocket events processed by `processChronikWsMsg` will still trigger instant refreshes.
The reasoning for moving away from basing fallback refresh intervals on websocket availability is because if there is no websocket then there is no chronik server either, so no need to distinguish between the two.