Followup to r1563066, fix test failures on Windows.

* subversion/tests/cmdline/diff_tests.py
  (diff_repo-wc_file_props): Overthought how to test eol-style, the file
    is already in LF style.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1563067 13f79535-47bb-0310-9956-ffa450edef68