Fix invalid TS definition for long variant constructors with no args

[richard-viney]

In v1.13.0 the following Gleam code

pub type ValueRepresentation {
  UniversalResourceIdentifier
}

generates the following invalid TypeScript definition

export function ValueRepresentation$UniversalResourceIdentifier(
  ,
): ValueRepresentation$;

The comma isn't valid there and gives the error Parameter declaration expected. from tsc.

This issue occurs when the variant constructor function name is long, and it takes no arguments.

[lpil]

Thank you! Left a note inline about approaching this another way

[lpil]

The tests are missing!

[richard-viney]

The tests are missing!

Not any more!