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/wifi/calling/WifiCallingSliceHelperTest.java

@@ -86,7 +86,7 @@ public class WifiCallingSliceHelperTest {
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
-        mContext = spy(RuntimeEnvironment.application);
+        mContext = RuntimeEnvironment.application;
 
         //setup for SettingsSliceProvider tests
         mProvider = spy(new SettingsSliceProvider());