Code cleanup in Zen Mode Settings

Changes in response to code review from automerged commit ag/3171711

Test: make -j40 RunSettingsRoboTests
Bug: n/a
Change-Id: I5df3db4e8ff421ca9911c84ae3f621a0e3d08092

src/com/android/settings/notification/ZenRulePreference.java

@@ -40,7 +40,7 @@ import com.android.settingslib.TwoTargetPreference;
 import java.util.Map;
 
 public class ZenRulePreference extends TwoTargetPreference {
-    protected final ManagedServiceSettings.Config CONFIG =
+    private static final ManagedServiceSettings.Config CONFIG =
             ZenModeAutomationSettings.getConditionProviderConfig();
     final CharSequence mName;
     final String mId;