Fix issue with SVN property changes under Windows

Summary: We were incorrectly matching `$` in the regexp against a possible `\r\n`. I missed this earlier when trying to catch all of these.

Test Plan:
  - Added unit test and made it pass.
  - Did another search for `getLine()` to see if I could spot any more of these, but failed to identify any via inspection.

Reviewers: vrana, mbishopim3

Reviewed By: mbishopim3

CC: aran

Differential Revision: https://secure.phabricator.com/D5038