Messaging: Fix modifiers

We either have too few or too many

Change-Id: I09a9a38b859c68526fcbcdbc7862afe1d693f6c0

src/com/android/messaging/util/DebugUtils.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.
@@ -95,7 +96,7 @@ public class DebugUtils {
     }
 
     public abstract static class DebugAction {
-        String mTitle;
+        final String mTitle;
         public DebugAction(final String title) {
             mTitle = title;
         }