Finish cleanup of CTS-V admin/tapjacking/UsbTest

This alias should have been removed with the test.

Bug: 241764499
Test: manual;
      Test alias is removed:
      > adb shell am start -e fingerprints placeholder -e key placeholder com.android.systemui/.usb.UsbDebuggingActivity
      No dialog should appear.

      Test remaining activity:
      > adb unroot
      > adb shell am start -e fingerprints placeholder -e key placeholder com.android.systemui/.usb.UsbDebuggingActivity
      No dialog should appear.

Change-Id: I51625874cb21ada1c0523d157c3f2d60f183b6c9