Validate passwd.shell.root after reading the credential so it uses
the same target-root shell checks as --root-shell= and prompted input.
Reproducer: CREDENTIALS_DIRECTORY=... systemd-firstboot --root=...
with passwd.shell.root=/bin/nonexistentshell
Before: /etc/passwd was written with the nonexistent root shell and
the command exited successfully.
Follow-up: 416f7b3a11
System and Service Manager
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