Fix set impl function body ending up in declaration files

[Sikarii]

The code generation for CJS and ESM generates invalid syntax for declaration files.

// dbschema/edgeql-js/syntax/setImpl.d.ts

declare function set<Expr extends TypeSet<BaseType> | castMaps.scalarLiterals>(
  ...exprs: Expr[]
): $expr_Set<
  TypeSet<
    getPrimitiveBaseType<castMaps.literalToTypeSet<Expr>["__element__"]>,
    Cardinality.Many
  >
>;
)
      .reduce(getSharedParent),
    __cardinality__: cardinalityUtil.mergeCardinalitiesVariadic(
      exprs.map(expr => expr.__cardinality__)
    ),
    __exprs__: exprs,
  });

}

This PR should fix the function body ending up in the declaration file.