Change visibility of passphrase protection later

When the EnterDetailsPage is created it is too early to
check for pgp() so we do it now when the result label
is updated as we then know if pgp was selected in
the dialog.
2 jobs for master in 19 minutes and 3 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #86402
build_clazy_clang_tidy

00:12:55

passed #86401
linux kf5-qt5 qt5.15

00:06:08

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