Fix problems with the menu bar on large screen Android devices

Fix problems with the menu bar on large screen Android devices

* java/org/gnu/emacs/EmacsActivity.java (onContextMenuClosed):
Process submenu closing normally if it happens more than 300 ms
after a submenu item was selected.
* java/org/gnu/emacs/EmacsContextMenu.java (EmacsContextMenu)
(onMenuItemClick, display1): Give `wasSubmenuSelected' different
values depending on how the submenu was selected.