Revert "<http://webkit.org/b/41788> commit-log-editor: wrong ChangeLog read when invoked from subdir with git"

This reverts commit r62692.

* Scripts/commit-log-editor:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@62990 268f45cc-cd09-0410-ab3c-d52691b4dbfc