TREZOR hardware wallet support is gone since Electrum was updated to 3.x

Regression introduced by #15022 (closed): we’re still installig python-trezor but it’s useless as the new Electrum is Python 3. python3-trezor is in sid.

Related issues

Related to #15022 (closed)
Related to #15189 (closed)

Original created by @intrigeri on 15390 (Redmine)

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