Add multisig_xpub_magic option to GetPublicKey #4305
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Fixes #2658
Adds a bool option
multisig_xpub_magictoGetPublicKey, so that Trezor displays XPUBs with the correct SLIP-132 prefix (XPUB magic) for SegWit v0 multisig accounts.See also Slack discussion about the solution: https://satoshilabs.slack.com/archives/C02V2PSDNA2/p1669125576505009
This PR unifies the xpub_magic handling for
get_public_key()andget_address(). Each function behaved a bit differently when the required SegWitcoin.xpub_magic_*attribute was not defined. One raised an exception while the other fell back to plain oldcoin.xpub_magic. However, from what I can tell, cointool.py guarantees that the attributes are defined ifcoin.segwitis true. So I feel that the simplest solution is to fall back.