[Formatting] Clean up extra newlines and spaces in suggested patches
[Formatting] Clean up extra newlines and spaces in suggested patches

Cleans up the formatting of suggested patches by removing spurious newlines in unmodified lines and removing spaces in front of the first line of the contextual snippet and the green "+" line.

Test Plan: Run `python setup.py install -f` and run codemod in a directory, output is noticeably cleaner.

facebook/codemod