Support PINs of arbirtrary length
Feature: https://source.puri.sm/Librem5/use-cases/issues/46, https://source.puri.sm/Librem5/use-cases/issues/45
We don't want to force the user to use 6 digits only.
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Feature: https://source.puri.sm/Librem5/use-cases/issues/46, https://source.puri.sm/Librem5/use-cases/issues/45
We don't want to force the user to use 6 digits only.