[display] hover only reports expression instead of field for abstract properties


Strangely, it works fine in classes, or even when just making the property static.


```haxe
class Main {
public static function main() {
var f:Foo = 0;
f.foo
}
}

abstract Foo(Int) from Int {
public var foo(get,never):Int;
function get_foo() return 0;
}
```