Can't switch navigation mode from search results

3 Navigation modes are mutually exclusive, we can't set all often
them on. Therefore we will now show them as slices.

Fixes: 131713601
Test: robolectric, manual
Change-Id: I52e94dffe15ed20a23a5e4cea68a40b66158b3dd

src/com/android/settings/gestures/SystemNavigationSwipeUpPreferenceController.java

@@ -42,11 +42,6 @@ public class SystemNavigationSwipeUpPreferenceController extends
         super(context, overlayManager, key);
     }
 
-    @Override
-    public boolean isSliceable() {
-        return TextUtils.equals(PREF_KEY_SWIPE_UP, getPreferenceKey());
-    }
-
     @Override
     public void onRadioButtonClicked(RadioButtonPreference preference) {
         setNavBarInteractionMode(mOverlayManager, NAV_BAR_MODE_2BUTTON_OVERLAY);