Don't pass the single quote format parameter when formatting things

Don't pass the single quote format parameter when formatting things

Summary:
We are formatting an integer value, so it is doing absolutely nothing at all, as confirmed by the version I implemented for MSVC, which does output the value with digit separators, which fails the unit tests because the unit test expects the digit separators to not be present. What's more, whe specifically assert that the user has not requested digit separators in the format string.
This also kills the MSVC special case entirely because it's not needed.

Reviewed By: yfeldblum

Differential Revision: D3768405

fbshipit-source-id: 388cd0ca9699e257c71798b9bf355aa651748e60