pw_kvs: Fix sectors test
pw_kvs: Fix sectors test

Add sectors_ reset as part of the fixture, since reset is required
before using sectors_. This prevents using uninitialized members, which
sometimes passes tests.

Change-Id: I293b3fe927eca1ec187f31b25087e8b2db3168d5
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/13842
Commit-Queue: David Rogers <82b08570d73cda922b440ccc756abc5b3ef4c372@google.com>
Reviewed-by: Wyatt Hepler <cca3bedb37979eacd157a9bceb473582df8aea1e@google.com>

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