Clean up unnecessary spy context statements

Remove spy context syntax because we do not need to
mock context anymore in the test cases.

Bug: 117644158
Test: robotests
Change-Id: I222eec4fbc1994d7bb79adead40b76ac0a000bdc

tests/robotests/src/com/android/settings/slices/SliceBuilderUtilsTest.java

@@ -79,7 +79,7 @@ public class SliceBuilderUtilsTest {
 
     @Before
     public void setUp() {
-        mContext = spy(RuntimeEnvironment.application);
+        mContext = RuntimeEnvironment.application;
         mFeatureFactory = FakeFeatureFactory.setupForTest();
         mLoggingArgumentCatpor = ArgumentCaptor.forClass(Pair.class);