[display] extends / implements / new filtering still applies in type params

I found this while verifying fixes for #8669, but it's unrelated to the recent changes and has probably been an issue from the start.

Requesting completion for type parameters after `implements` still filters the result to only contain interfaces, which is incorrect:


```haxe
class Main implements ArrayAccess<> {
static function main() {}
}
```

Same issue with `extends` and `new`.