bug#43704: 26.1: gpg error on passphrase typo

[Boruch Baum]

When making a mistake typing a gpg passphrase, an 'error' is generated,
instead of a 'user-error'. The significance of the difference is that if
the user has enabled 'toggle-debug-on-error', the typo generates an
annoying backtrace buffer that then needs to be killed, followed by a
window navigation to the gpg buffer in use.
S
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