Trailing comma in function literal is incorrectly formatted and results in false positive at next invocation

[paul-dingemans]

Given code below and that trailing comma's on declaration site are enabled:

val foo = {
        string: String,
        int: Int ->
    // do something
}

then this code is formatted as:

val foo = {
        string: String,
        int: Int, ->
    // do something
}

and on the next invocation of ktlint, it reports violation below:

Whitespace after ',' is missing (experimental:parameter-list-spacing)

On the first invocation, the code should be formatted as:

val foo = {
        string: String,
        int: Int,
    ->
    // do something
}

and no violation may be reported on following invocations