Temporarily use default webp encode method for bzl

I suspect that this will fix the failing golden image tests.

Bug: skia:
Change-Id: I9f88206ae782e6a04817e72cdfcb3e0c4bdaa293
Reviewed-on: https://skia-review.googlesource.com/17393
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
2 files changed