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

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/lazy/descriptors/LazyJavaAnnotationDescriptor.kt

@@ -132,7 +132,7 @@ class LazyJavaAnnotationDescriptor(
         // Class type is never nullable in 'Foo.class' in Java
         val type = TypeUtils.makeNotNullable(c.typeResolver.transformJavaType(
                 javaType,
-                TypeUsage.COMMON.toAttributes(allowFlexible = false))
+                TypeUsage.COMMON.toAttributes())
         )
 
         val jlClass = c.module.resolveTopLevelClass(FqName("java.lang.Class"), NoLookupLocation.FOR_NON_TRACKED_SCOPE) ?: return null