Messaging: Fix modifiers

We either have too few or too many

Change-Id: I09a9a38b859c68526fcbcdbc7862afe1d693f6c0

src/com/android/messaging/widget/WidgetConversationService.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2024 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -72,7 +73,7 @@ public class WidgetConversationService extends RemoteViewsService {
      */
     private static class WidgetConversationFactory extends BaseWidgetFactory {
         private ImageResource mImageResource;
-        private String mConversationId;
+        private final String mConversationId;
 
         public WidgetConversationFactory(Context context, Intent intent) {
             super(context, intent);