Fix "choose icon" on profile menu items

Summary:
Ref T10054. This fix is a little rough but the "right" fix involves a ton of rewriting to AphrontSideNavFilterView and I don't want to open that can of worms up yet.

Specifically, the problem is:

• we build the menu in order to populate the mobile/application menu;
• as a side effect of building the menu (not rendering the menu), we initialize the menu collapse/expand behavior;
• but we never actually render the menu, so the JX.$() call fails.

The right fix would be to initialize the behavior only when we render the menu, but then AphorntSideNavFilterView would need to know about profile menu behaviors. It probably should some day, but I think today is not that day.

Test Plan: Set icons on a link on a profile menu.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10054

Differential Revision: https://secure.phabricator.com/D15073