Added missing parameter

Signed-off-by: Ivan Malygin <ivan@swirldslabs.com>

Author: imalygin

pbj-core/pbj-compiler/src/main/java/com/hedera/pbj/compiler/impl/generators/protobuf/CodecDefaultInstanceMethodGenerator.java

@@ -8,7 +8,7 @@
  */
 public class CodecDefaultInstanceMethodGenerator {
 
-    static String generateGetDefaultInstanceMethod() {
+    static String generateGetDefaultInstanceMethod(String modelClassName) {
         return """
             /**
              * Get the default value for the model class.
@@ -19,6 +19,7 @@ static String generateGetDefaultInstanceMethod() {
                 return $modelClass.getDefaultInstance();
             }
             """
+                .replace("$modelClass", modelClassName)
                 .indent(DEFAULT_INDENT);
     }
 }

pbj-core/pbj-compiler/src/main/java/com/hedera/pbj/compiler/impl/generators/protobuf/CodecGenerator.java

@@ -124,7 +124,7 @@ public final class $codecClass implements Codec<$modelClass> {
                     .replace("$measureDataMethod", CodecMeasureDataMethodGenerator.generateMeasureMethod(modelClassName, fields))
                     .replace("$measureRecordMethod", CodecMeasureRecordMethodGenerator.generateMeasureMethod(modelClassName, fields))
                     .replace("$fastEqualsMethod", CodecFastEqualsMethodGenerator.generateFastEqualsMethod(modelClassName, fields))
-                    .replace("$getDefaultInstanceMethod", generateGetDefaultInstanceMethod())
+                    .replace("$getDefaultInstanceMethod", generateGetDefaultInstanceMethod(modelClassName))
             );
         // spotless:on
         }