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.txt

@@ -8,7 +8,7 @@ public open class ClassObjectArrayInParam {
         public final val value: kotlin.Array<kotlin.reflect.KClass<*>>
     }
 
-    @test.ClassObjectArrayInParam.Anno(value = {test.ClassObjectArrayInParam::class, test.ClassObjectArrayInParam.Nested::class, kotlin.String::class}) public open class Nested {
+    @test.ClassObjectArrayInParam.Anno(value = {test.ClassObjectArrayInParam::class, test.ClassObjectArrayInParam.Nested::class, kotlin.String::class, kotlin.collections.(Mutable)List<(raw) kotlin.Any?>::class, kotlin.Array<(out) kotlin.Array<(out) kotlin.String!>!>::class, kotlin.Array<(out) kotlin.IntArray!>::class}) public open class Nested {
         public constructor Nested()
     }
 }