TrafficControllerTest - trivial simplification am: 0dfbdf36cd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/18695354

Change-Id: I1584370a8d0497d061410eb4d5da28005551754c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>