[Test] Modify test to match the behavior change in DnsBpfHelper am: 25992f76 am: 2787b9e2

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2864726



Change-Id: I0df936207888d288a8e8b94474adb0b78ea2ade5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>