Use properties of Java annotations in codegen tests

Retain obsolete versions until support for methods in Java annotations is dropped

compiler/testData/codegen/boxAgainstJava/annotations/kClassMapping/classParameter.kt

@@ -6,5 +6,5 @@ JavaAnn(OK::class) class MyClass
 fun box(): String {
     val ann = javaClass<MyClass>().getAnnotation(javaClass<JavaAnn>())
     if (ann == null) return "fail: cannot find JavaAnn on MyClass"
-    return ann.value().simpleName!!
+    return ann.value.simpleName!!
 }