add additional ReplaceAll in pathsep to cater for different pathsep (#34061)

The doctor storage check reconstructs the lfs oid by producing a string
where the path separator is stripped
ab/dc/efg -> abdcefg. Windows however uses a backslash and thus the
ReplaceAll call doesn't produce the correct oid resulting in all lfs
objects being classed as orphaned.
This PR allows this to be more OS agnostic.

Closes #34039

---------

Co-authored-by: Giteabot <teabot@gitea.io>

services/doctor/storage.go

@@ -121,7 +121,7 @@ func checkStorage(opts *checkStorageOptions) func(ctx context.Context, logger lo
 					storer: storage.LFS,
 					isOrphaned: func(path string, obj storage.Object, stat fs.FileInfo) (bool, error) {
 						// The oid of an LFS stored object is the name but with all the path.Separators removed
-						oid := strings.ReplaceAll(path, "/", "")
+						oid := strings.ReplaceAll(strings.ReplaceAll(path, "\\", ""), "/", "")
 						exists, err := git.ExistsLFSObject(ctx, oid)
 						return !exists, err
 					},