[roll pigweed] pw_env_setup: Don't clear gni vars in CIPD hook

Don't clear the variables in the pigweed_environment.gni file when the
CIPD post-checkout hook runs.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/105157

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 05b8e4e0567085a..3bf6cd199d754cb
Roller-URL: https://ci.chromium.org/b/8806642204548795889
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8806642204548795889
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ifc1fb9b3f9f5189a5fe45261287cb3b41b35e782
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/105221
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/pigweed b/pigweed
index 05b8e4e..3bf6cd1 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 05b8e4e0567085a2442ebc14720295c6b63bf3de
+Subproject commit 3bf6cd199d754cbac9692b7c4871db63a4ca6ba3