Pass hint path to CreateBlob.

So that git knows the file type and can do line-ending conversion.

Author: grokys

src/GitHub.App/Services/GitClient.cs

@@ -206,7 +206,7 @@ public Task<ContentChanges> CompareWithString(IRepository repository, string sha
                 {
                     var contentStream = new MemoryStream(Encoding.UTF8.GetBytes(contents));
                     var blob1 = commit[path]?.Target as Blob ?? repository.ObjectDatabase.CreateBlob(new MemoryStream());
-                    var blob2 = repository.ObjectDatabase.CreateBlob(contentStream);
+                    var blob2 = repository.ObjectDatabase.CreateBlob(contentStream, path);
                     return repository.Diff.Compare(blob1, blob2);
                 }