Fixes #4630.

The entire immediate invocation for creating a class expression needs to be parenthesized to avoid the new operator from taking over the argument list.

Since a function expression doesn't need to be parenthesized before calling, we can just shift the closing paren that surrounds the function expression to also surround the argument list.

In other words, this:

new (function () {
    function Ship() {
    }
    return Ship;
})() // <- watch this line

becomes

new (function () {
    function Ship() {
    }
    return Ship;
}()) // <- see here?