Support auto cancel for notification of setting changed

Bug: 207203770
Test: Manual
Change-Id: I74b72e4345e181671f5cac1203808669b27e7bab
diff --git a/src/com/android/cellbroadcastreceiver/CellBroadcastConfigService.java b/src/com/android/cellbroadcastreceiver/CellBroadcastConfigService.java
index d00eef8..29f0024 100644
--- a/src/com/android/cellbroadcastreceiver/CellBroadcastConfigService.java
+++ b/src/com/android/cellbroadcastreceiver/CellBroadcastConfigService.java
@@ -113,7 +113,8 @@
                         .setContentTitle(c.getString(R.string.notification_cb_settings_changed_title))
                         .setContentText(c.getString(R.string.notification_cb_settings_changed_text))
                         .setSmallIcon(R.drawable.ic_settings_gear_outline_24dp)
-                        .setContentIntent(pi);
+                        .setContentIntent(pi)
+                        .setAutoCancel(true);
                 NotificationManager notificationManager = c.getSystemService(
                         NotificationManager.class);
                 notificationManager.notify(