Change signature adds unnecessary argument names

Version Used: 16.5.0 Preview 2.0 [29615.19.master]

Steps to Reproduce:

class Program
{
    static void F(int a, int b, int c)
    {
    }

    static void Main()
    {
        F(1, b: 2, 3);
    }
}

1. Invoke change signature on F
2. Move parameter a to the end of the signature.

Expected Behavior:

class Program
{
    static void F(int b, int c, int a)
    {
    }

    static void Main()
    {
        F(b: 2, 3, 1);
    }
}

Actual Behavior:

class Program
{
    static void F(int b, int c, int a)
    {
    }

    static void Main()
    {
        F(b: 2, c: 3, a: 1);
    }
}