Get rid of trivial allowFlexible replacing

As the type is anyway replaced with not-nullable version
explicitly, the only thing that changes is what type is loaded
for String[][].class:
- before it would be Array<Array<String?>?>
- now it's Array<(out) Array<(out) String!>!>

It's both a minor change and new behaviour can be considered
as correct

compiler/testData/loadJava/compiledJava/annotations/ClassObjectArrayInParam.java

@@ -5,6 +5,6 @@ public class ClassObjectArrayInParam {
         Class<?>[] value();
     }
 
-    @Anno({ClassObjectArrayInParam.class, Nested.class, String.class})
+    @Anno({ClassObjectArrayInParam.class, Nested.class, String.class, java.util.List.class, String[][].class, int[][].class})
     public static class Nested {}
 }