[autoroll] Fix skia-flutter config
[autoroll] Fix skia-flutter config

Bug: skia:
Change-Id: I3dc59d43d9c390275c15c4db37c9d0761dd900d7
Reviewed-on: https://skia-review.googlesource.com/c/176003
Reviewed-by: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@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