[roll third_party/pigweed] pw_presubmit: Update buildifier invocation

Buildifier is removing some linter warnings (by merging them into the
default formatting process), see
https://github.com/bazelbuild/buildtools/pull/1244. This change will
prevent a breakage from occurring when we roll a buildifier update that
contains this PR.

Internally see also g/copybara-users/c/Jkgv3DH-lyk

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/200350

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 917b5b7db5b6bba..15303ba92faa0dd
Roller-URL: https://ci.chromium.org/b/8752235784797268913
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iad307ec666c7784e37705519048a1d0f9ccef10d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/200890
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 917b5b7..15303ba 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 917b5b7db5b6bba47b29a3fa5befff0caf155073
+Subproject commit 15303ba92faa0dd3d5be144dfaa5317fa259d400