- makes it consistent between the qml and qt guis that now both show the hex pubkey
- previously qml was showing npub
- don't truncate to first 10 chars, as that's still easy to bruteforce
- the qt gui has space to display the full pubkey (64 hex chars)
and can use the TreeWidget's columns to truncate as needed
- qml has less space, truncate to 32 hex chars there (128 bits should be enough against bruteforce)
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