[R1shabh-Gupta]

On touch devices, tapping a parent item in Twenty Eleven's main menu opens its link right away, so the submenu can't be used. This happens mostly on Android. This PR adds a small script so the first tap on a menu item with a submenu opens it, and a second tap follows the link.

Testing instructions

1. Activate Twenty Eleven and assign a primary menu with nested items (a parent with a child, and a child with its own child).
2. On a touch device, tap a parent item: its submenu opens and the page doesn't change.
3. Tap the same item again: its link opens.
4. Check that nested submenus open, that tapping outside the menu closes them, and that after pressing Back the menu is closed.

I tested it on my Pixel phone (Android, Chrome) and on iOS Safari in the Simulator.

Trac ticket: https://core.trac.wordpress.org/ticket/38982

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