Mac: file events are not reported when using workspace path with different casing

Interestingly on Mac when opening VS Code on a workspace path that does not match 100% the casing of the workspace as it is on disk, all file events are not working anymore, even though the rest of the program is functional.

Filed: https://github.com/paulmillr/chokidar/issues/418
