A security update that fixes Calamares bug CAL-405:
https://calamares.io/bugs/browse/CAL-405

When installing with a LUKS-encrypted `/` partition, Calamares was always creating a keyfile to decode `/` and storing it in the initramfs. It did that even with an unencrypted separate `/boot` partition. As a result, the keyfile would be stored in cleartext on the `/boot` partition, and it was possible to unlock the `/` partition without ever entering a passphrase. This completely defeated the security of LUKS.

Please note that this only affects manual partitioning. The automatic partitioning never leaves `/boot` unencrypted (and it is, in fact, recommended to also always encrypt `/boot` when doing manual partitioning).

This update fixes the `dracutlukscfg` module to not add the keyfile to `install_items` in the `dracut` configuration (so that `dracut` will not include it onto the initramfs) if `/boot` is separate and unencrypted.