Fix lint errors in NetworkStatsManagerTest. am: 687c383d78 am: 435f5433f7 am: af2f747a2a am: 7462612bbb

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1967180

Change-Id: I9f836cfe8ee2af9f4437610f4230372c0bb6cb56