Remove duplicates between battery and display settings

Change preference keys of duplicate settings between
display and battery to avoid duplication in search.

Bug: 33701673
Test: make RunSettingsRoboTests
Change-Id: I56c82e9e7f163d345065ca478849de9b14c173fe

tests/robotests/src/com/android/settings/display/TimeoutPreferenceControllerTest.java

@@ -42,11 +42,13 @@ public class TimeoutPreferenceControllerTest {
     private TimeoutListPreference mPreference;
     private TimeoutPreferenceController mController;
 
+    private static final String KEY_SCREEN_TIMEOUT = "screen_timeout";
+
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
 
-        mController = new TimeoutPreferenceController(mContext);
+        mController = new TimeoutPreferenceController(mContext, KEY_SCREEN_TIMEOUT);
     }
 
     @Test