Follow up on remaining paramArray errors

The following test cases created in PR #1304 do not work right now:

```python
    res = MethodTest.ParamsArrayOverloaded(1, 2, i=1)
    assert res == "with params-array"

    res = MethodTest.ParamsArrayOverloaded(paramsArray=[], i=1)
    assert res == "with params-array"
``` 

The respective calls are not matched to the C# method.