frcKillRobot.sh newlines should be forced to unix

[virtuald]

https://www.chiefdelphi.com/t/frozen-runpy-and-fatal-python-error/485006/19

If a user installs robotpy-installer from git on windows and autocrlf is on (default), then the file has the wrong newlines. Need to check for this case and fix it, as this would potentially apply to a local checkout of robotpy-installer also.