Remove service before adding test mock.

Bug: 223101827
Change-Id: I45788f4ca7add353135ff3af73de2b5f4997ff14
Test: N/A

services/tests/servicestests/src/com/android/server/usage/AppStandbyControllerTests.java

@@ -489,6 +489,7 @@ public class AppStandbyControllerTests {
 
     @Before
     public void setUp() throws Exception {
+        LocalServices.removeServiceForTest(UsageStatsManagerInternal.class);
         LocalServices.addService(
                 UsageStatsManagerInternal.class, mock(UsageStatsManagerInternal.class));
         MyContextWrapper myContext = new MyContextWrapper(InstrumentationRegistry.getContext());