[IconMenu] Fix controlled IconMenus to honor onRequestChange

[hai-cea]

• PR has tests / docs demo, and is linted.
• Commit and PR titles begin with [ComponentName], and are in imperative form: "[Component] Fix leaky abstraction".
• Description explains the issue / use-case resolved, and auto-closes the related issue(s) (http://tr.im/vFqem).

This PR fixes a problem that allows controlled icon menus to close on its own. Now, if the icon menu is controlled, it will just call onRequestChange and not automatically close the menu.

[oliviertassinari]

That looks good to me. Thanks.
That could be considered a breaking change, but I would rather see this as a bug. That would have been better with a test.

[oliviertassinari]

@hai-cea Your last PR was some time ago. I'm glad to see you back 😄 .

[hai-cea]

Thanks @oliviertassinari - Trying to get back at it. I will do better next time with tests. :)