Fix compilation error

Author: Johan-Liebert1

crates/lib/src/install.rs

@@ -2148,6 +2148,7 @@ pub(crate) async fn install_to_existing_root(opts: InstallToExistingRootOpts) ->
         compoesfs_opts: InstallComposefsOpts {
             insecure: false,
             bootloader: Bootloader::Grub,
+            uki_addon: None
         },
     };