Improve Night Light suggestion criterion

Night Light suggestion will now show even if the user is using Night
Light in manual mode. If the user has previously tapped or dismissed the
suggestion, the suggestion will not show again.

Bug: 68938869
Test: make ROBOTEST_FILTER=\
"(NightDisplayPreferenceControllerTest|SuggestionFeatureProviderImplTest)" \
RunSettingsRoboTests

Change-Id: Iea838df043d75dfa73a1a383275dc42956374113

src/com/android/settings/display/NightDisplayPreferenceController.java

@@ -28,6 +28,11 @@ public class NightDisplayPreferenceController extends AbstractPreferenceControll
         super(context);
     }
 
+    public static boolean isSuggestionComplete(Context context) {
+        final ColorDisplayController controller = new ColorDisplayController(context);
+        return controller.getAutoMode() != ColorDisplayController.AUTO_MODE_DISABLED;
+    }
+
     @Override
     public boolean isAvailable() {
         return ColorDisplayController.isAvailable(mContext);