Host backup restore from installer fails on UEFI hosts

This is a regression in CH 8.1.

On UEFI hosts, using the installer to restore from the backup partition fails at the bootloader setup stage, with error "setEfiBootEntry() takes exactly 5 arguments (4 given)".

This leaves the host in an unbootable state.

The error comes from this line: https://github.com/xcp-ng/host-installer/blob/XS-8.1.0/restore.py#L137

In 8.1, the setEfiBootEntry method signature has been changed to add a 'install_type' parameter, but only one of the two calls to this function was updated.

Exact steps to reproduce:

• Install CH 8.0 on an UEFI host.
• Upgrade to CH 8.1
• Use the CH 8.1 installer to revert to 8.0

Note : has been reproduced by several users on XCP-ng 8.1, in addition to my test on CH 8.1 (see attached screenshot)