Don't initialize already initialized final fields. Fixes #1829.

test/transform/resource/after-ecj/NoArgsConstructorForce.java

@@ -3,6 +3,7 @@ public @NoArgsConstructor(force = true) class NoArgsConstructorForce {
   private final int[] i;
   private final Object[] o;
   private final java.util.List<?>[] fullQualifiedList;
+  private final String alreadyInitialized = "yes";
   public @java.lang.SuppressWarnings("all") NoArgsConstructorForce() {
     super();
     this.i = null;