[electrum] Fix the homescreen change with all devices

Summary: The Safe 3 requires to handle the TOIG format so it's explicitely not supported for now. New devices should be supported automatically with this code change.

Test Plan: Change the homescreen for all devices.

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17546