[roll third_party/pigweed] pw_presubmit: Make copyright check more forgiving

Be more flexible with whitespace in the copyright check. After updating
to Go v1.19 (pwrev/105381) 'go fmt' wants to change repeated spaces in
comments into tabs. Continue to require the content of the copyright
lines match, but be flexible about the whitespace around that content
for *.go files.

Also, fix the things 'go fmt' wants to fix.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/105400

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 0f9876351caed98..de62a2de159d920
Roller-URL: https://ci.chromium.org/b/8806288469860412641
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8806288469860412641
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1027278d45ef52d20c2523f713f8078a0d301547
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/105601
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 0f98763..de62a2d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 0f9876351caed9839c92e8ec86a0caebdd9b2646
+Subproject commit de62a2de159d920d2b19ca414b4d41681310789e