container/autoroot: remove prefix field

This field has been a noop for a long time. Remove it to prevent further confusion.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/app/container_linux.go

@@ -75,7 +75,7 @@ func newContainer(s *hst.ContainerConfig, os sys.State, prefix string, uid, gid
 	}
 
 	if s.AutoRoot != nil {
-		params.Root(s.AutoRoot, prefix, s.RootFlags)
+		params.Root(s.AutoRoot, s.RootFlags)
 	}
 
 	params.