pw_assert_tokenized: Add missing pw namespace
pw_assert_tokenized: Add missing pw namespace

An `endian::little` reference was missing the pw namespace.

Change-Id: I48bf2dd3eda081d975e7131d25726f02061d2ebd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/101540
Commit-Queue: Auto-Submit <14637eda5603879df170705285bf30f5996692f0@pigweed.google.com.iam.gserviceaccount.com>
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Pigweed-Auto-Submit: Anthony DiGirolamo <4cc40125edc24ec5bc72df7917ea0b403ee8cebe@google.com>

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed