CtsVerifier: fixes Utils.showBugreportNotification()

The device owner receiver should send notifications to the current
user, otherwise they won't be shown on systems running with headless
system user mode.

Test: adb shell am start com.android.cts.verifier/.managedprovisioning.DeviceOwnerRequestingBugreportTestActivity
Fixes: 208554284
Bug: 192395248

Change-Id: Iac5b92bdb79bc5a22a90ba8910513a294dafc528
1 file changed