Make sure the right DND config is used

The notifications are sometimes updated before the new
reminder policy is set and are incorrectly shown/hidden
in the statusbar and notification panel.

Bug: 152070118
Test: Manual - See bug details
Change-Id: I3352cdd71538dd9f1333b6e737690e39dd713ee4

services/core/java/com/android/server/notification/ZenModeHelper.java

@@ -844,13 +844,13 @@ public class ZenModeHelper {
             final boolean policyChanged = !Objects.equals(getNotificationPolicy(mConfig),
                     getNotificationPolicy(config));
             if (!config.equals(mConfig)) {
+                mConfig = config;
                 dispatchOnConfigChanged();
                 updateConsolidatedPolicy(reason);
             }
             if (policyChanged) {
                 dispatchOnPolicyChanged();
             }
-            mConfig = config;
             mHandler.postApplyConfig(config, reason, triggeringComponent, setRingerMode);
             return true;
         } catch (SecurityException e) {