Mojo::File::list_tree on Win32 incorrectly includes the root dir

[damil]

Line 76 in Mojo::File::list_tree says "delete $all{$$self}"; this does not work on Win32 because keys in %all are paths in "foo/bar" syntax, while $$self is in "foo\bar" syntax.

Subtest 'list/list_tree' in file.t fails for this reason.

I did not propose a patch because I'm not sure where would be the proper place to make sure that all paths use the same, canonical syntax.