@toString doesn't distinguish between parameter lists

## Version

`0.1.0`

## Minimized code
```scala
import steps.annotation.toString

@toString
class Foo(x: Int)(y: Int)
val foo = Foo(1)(2)
println(foo)
```
## Output

```scala
Foo(1, 2)
```
## Expected
```scala
Foo(1)(2)
```
