[roll pigweed] pw_cli: Remove old variable from env

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/103603

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 93ded304b802eef..287b6e75fe51f48
Roller-URL: https://ci.chromium.org/b/8806896628468506033
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8806896628468506033
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Icd48adde905fa5d90f5692724f608af1780d78ea
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/104762
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 93ded30..287b6e7 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit 93ded304b802eefd4294b8ce96c4338be5c76148
+Subproject commit 287b6e75fe51f48da8e4bbc9bb1f0fa7354bcd6e