BpfHandlerTest - minor fixups

Per request from Lorenzo on:
  https://googleplex-android-review.git.corp.google.com/c/platform/packages/modules/Connectivity/+/18695355
during cherrypick to tm-dev.

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Id9e856f1b1c042993e6429e55999bffd9dfb9b12
1 file changed