Fix setting of generation option with default to previous behavior

Author: atextor

core/esmf-aspect-model-java-generator/src/main/java/org/eclipse/esmf/aspectmodel/java/JavaCodeGenerationConfig.java

@@ -35,7 +35,7 @@
 @RecordBuilder
 public record JavaCodeGenerationConfig(
       boolean enableJacksonAnnotations,
-      boolean enableJacksonAnnotationJsonFormatShapeObject,
+      Boolean enableJacksonAnnotationJsonFormatShapeObject,
       JsonTypeInfoType jsonTypeInfo,
       String packageName,
       ImportTracker importTracker,
@@ -50,8 +50,9 @@ public enum JsonTypeInfoType {
    }
 
    public JavaCodeGenerationConfig {
-      enableJacksonAnnotationJsonFormatShapeObject = true;
-
+      if ( enableJacksonAnnotationJsonFormatShapeObject == null ) {
+         enableJacksonAnnotationJsonFormatShapeObject = true;
+      }
       if ( jsonTypeInfo == null ) {
          jsonTypeInfo = JsonTypeInfoType.DEDUCTION;
       }