Add comments to explain the branching in PreferencesBackend::resetEncryption.
Add comments to explain the branching in PreferencesBackend::resetEncryption.

LedgerHQ/lib-ledger-core,LedgerHQ/lib-ledger-core,LedgerHQ/lib-ledger-core,LedgerHQ/lib-ledger-core,LedgerHQ/lib-ledger-core,LedgerHQ/lib-ledger-core,LedgerHQ/lib-ledger-core