Bring back silent icons for Q->Q devices

When the setting went away, existing devices
should have been cleaned up. better late than never?

Fixes: 134159339
Test: apply patch on device with hidden icons
Change-Id: I22f3344b4fcd57902829105c51c92ee0bef51410
diff --git a/services/core/java/com/android/server/notification/PreferencesHelper.java b/services/core/java/com/android/server/notification/PreferencesHelper.java
index 1c0ac16..7b45a1b 100644
--- a/services/core/java/com/android/server/notification/PreferencesHelper.java
+++ b/services/core/java/com/android/server/notification/PreferencesHelper.java
@@ -78,7 +78,7 @@
     private static final String TAG_CHANNEL = "channel";
     private static final String TAG_GROUP = "channelGroup";
     private static final String TAG_DELEGATE = "delegate";
-    private static final String TAG_STATUS_ICONS = "status_icons";
+    private static final String TAG_STATUS_ICONS = "silent_status_icons";
 
     private static final String ATT_VERSION = "version";
     private static final String ATT_NAME = "name";