[Test] Modify test to match the behavior change in DnsBpfHelper am: 25992f76 am: 16054083

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



Change-Id: I578bff9c1bea99b1bcb643bcc992ffd8d01598c2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>