format public.bzl

Change-Id: Ie92b366e5d6e6fcb99c56e80f34e315ad1be8831
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214093
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/public.bzl b/public.bzl
index c666c9e..cc86210 100644
--- a/public.bzl
+++ b/public.bzl
@@ -218,8 +218,8 @@
     ],
     exclude = [
         # Exclude platform-dependent files.
-        "src/codec/*",    # Decoders
-        "src/images/*",   # Encoders
+        "src/codec/*",  # Decoders
+        "src/images/*",  # Encoders
         "src/device/xps/*",  # Windows-only. Move to ports?
         "src/doc/*_XPS.cpp",  # Windows-only. Move to ports?
         "src/gpu/gl/android/*",