Update enabled state of ZenRulePreference

Test: manual
  1. Settings > Sound > Do Not Disturb > Schedules > Sleeping
  2. Toggle enable state of DND rule to ON
  3. Navigate back
  4. Observe: Sleeping rule is enabled visually (check box is checked)
Fixes: 140090071
Change-Id: I44078cdba9642eea93f9b6d2eb3eef486d3c38bc

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

@@ -125,8 +125,8 @@ public class ZenRulePreference extends TwoTargetPreference {
         }
 
         if (mRule.isEnabled() != rule.isEnabled()) {
-            setChecked(mRule.isEnabled());
-            setSummary(computeRuleSummary(mRule));
+            setChecked(rule.isEnabled());
+            setSummary(computeRuleSummary(rule));
         }
 
         mRule = rule;