cert-chooser: do not show "Show Passwords" with no password entry
If we want a certificate only (as opposed to a key) in PEM file, we don't ask for any passwords and thererfore don't need the "Show Passwords" checkbox.
If we want a certificate only (as opposed to a key) in PEM file, we don't ask for any passwords and thererfore don't need the "Show Passwords" checkbox.