[BUG] _this missing from arguments when transpiling a function

```sqf
player addEventHandler ["HandleDamage", {
    hint format ["You just sustained %1%2 damage!", ceil ((_this select 2) * 100), "%"];
}];
```

Gives:

```sqf
player.addeventhandler("HandleDamage", function() {
    hint($"You just sustained {ceil(_this[2] * 100)}{"%"} damage!");
});
```