[Bazel] Reformat public.bzl with buildifier.

Bug: skia:8210
No-Try: true
Change-Id: I259fa3ee0bccdfb8999366596a0b210626ee26aa
Reviewed-on: https://skia-review.googlesource.com/144501
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
1 file changed