Fix KeyguardViewMediatorTest.

This changelist updates a test to make it compatible with upstream
changes. This update has already been applied downstream.

Test: atest KeyguardViewMediatorTest#wakeupFromDreamingWhenKeyguardHides
Fixes: 293948457
Change-Id: Iaf037cdb44bb108d013785c20cc0272a4608c73a

packages/SystemUI/tests/src/com/android/systemui/keyguard/KeyguardViewMediatorTest.java

@@ -337,6 +337,8 @@ public class KeyguardViewMediatorTest extends SysuiTestCase {
         mViewMediator.onSystemReady();
         TestableLooper.get(this).processAllMessages();
 
+        when(mPowerManager.isInteractive()).thenReturn(true);
+
         // Given device is dreaming
         when(mUpdateMonitor.isDreaming()).thenReturn(true);