fix: Handle module.exports = class Foo when locating classes

[bizob2828]

I was trying to transform a CJS module where I had defined the class as

module.exports = class MyClass {
  constructor() {
    this.name = 'MyClass';
  }
};

I found it was not working as expected. It did work if I defined it as

class MyClass {
  constructor() {
    this.name = 'MyClass';
  }
}

module.exports = MyClass;

I realized after using AST Explorer that the first example was not being transformed correctly because it was not recognizing the class declaration but instead a class expression.