Disable MDnsTest.RefreshQuery on fuchsia

The test is flaky.

Bug: 1274091
Change-Id: Iae0106108f61a76c24dfbf2e1b488470a24f1a56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4546943


Commit-Queue: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1146413}