dpc: fix DisplayPowerControllerTest for cancelBlockScreenOn

Flag: com.android.server.display.feature.flags.offload_session_cancel_block_screen_on
Test: atest DisplayOffloadSessionImplTest
Test: atest DisplayPowerControllerTest
Bug: 346420374
Bug: 347415946
Bug: 349320166

Change-Id: I30bde106483a726cc0ba0cf9c8a08bf18c7116a4
2 files changed