pw_containers: Fix variables in filtered_view_test
pw_containers: Fix variables in filtered_view_test

The tests were iterating over the incorrect container in a few places.

Change-Id: I8dfebd58c48c11aea538e05298e2cc75ed1542fd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/110990
Pigweed-Auto-Submit: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>
Reviewed-by: Ewout van Bekkum <638f134dbc68778d6b859fb04a64baea2b00b021@google.com>
Commit-Queue: Auto-Submit <14637eda5603879df170705285bf30f5996692f0@pigweed.google.com.iam.gserviceaccount.com>

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