Remove empty lines from CSV

Both `,,,,,,` and `Executive Branch,,,,,,,` type empty lines in a few places.

Also, use unix style new lines, rather than windows new lines because sanity.

[rendered](https://github.com/benbalter/OMB-Agency-Bureau-and-Treasury-Codes/blob/6fb168131b1e39bc6671d00044af7634428a0230/omb-agency-bureau-treasury-codes.csv)