Display passphrase field in new UI when replacing an encrypted disk
Seen in FreeNAS-11.2-MASTER-201809250855
Steps to reproduce:
1. Create a mirrored pool
2. Encrypt it and set a passphrase for it. Do not lock it.
3. Offline one of the disk.
4. Try to replace the disk.
5. Observe the bug. See screenshot.
It shows the text saying the field is required, but no field is present.