[roll pigweed] pw_tokenizer: Only update directory database CSVs from previous commit

- Change the ordering of retrieving CSVs.
- Use HEAD~ to find a CSV and check the CSV found is not in the
  provided commit.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/107345

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: fc5105ad72fd6bc..a62254c1ddf92f0
Roller-URL: https://ci.chromium.org/b/8805453377836168561
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I19f2c14b7dee3dfc28d83bd5b3332fc0eba74b60
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/107398
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 fc5105a..a62254c 160000
--- a/pigweed
+++ b/pigweed
@@ -1 +1 @@
-Subproject commit fc5105ad72fd6bcb6a09b82a963c21e282e9f04c
+Subproject commit a62254c1ddf92f061373660945841e9ac8d0809c