[autoroll] Fix gitcookies path
[autoroll] Fix gitcookies path

Forgot to do this before...

BUG=skia:5787

Change-Id: I3eaf6c27e9f08be156696390b9eb251a0bca5117
Reviewed-on: https://skia-review.googlesource.com/8943
Reviewed-by: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>
Commit-Queue: Eric Boren <0e499112533c8544f0505ea0d08394fb5ad7d8fa@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot