[Android] Remove unecessary spy in FlutterActivityAndFragmentDelegateTest (flutter#177120)

Title says it all :)

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Author: camsim99

engine/src/flutter/shell/platform/android/test/io/flutter/embedding/android/FlutterActivityAndFragmentDelegateTest.java

@@ -18,7 +18,6 @@
 import static org.mockito.Mockito.clearInvocations;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.never;
-import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.times;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -1617,8 +1616,7 @@ public void itDoesNotDetachTwice() {
 
   @Test
   public void onResume_restoresSurfaceProducers() {
-    FlutterActivityAndFragmentDelegate delegate =
-        spy(new FlutterActivityAndFragmentDelegate(mockHost));
+    FlutterActivityAndFragmentDelegate delegate = new FlutterActivityAndFragmentDelegate(mockHost);
 
     delegate.onAttach(ctx);
     delegate.onResume();