Templates are not mapped when using self-call struct as a function argument

```js
/// @hint SorterT<T>:(a:T, b:T)->int
/// @hint SorterT<T>:invoke(a:T, b:T)->int

let a1 = [1, 2, 3];
let a2 = ["1", "2", "3"];

var sorterT:SorterT<int>;
array_sort(a1, sorterT); // OK
array_sort(a2, sorterT); // should warn but it doesn't
array_sort(a1, sorterT.invoke); // OK
array_sort(a2, sorterT.invoke); // warns as expected
```