Revert "Don't report all context menus in NVDA's GUI as if they were the NVDA menu itself."
This implementation could break in some rare cases if a plugin bound a modal dialog to a menu item, as this wouldn't get intercepted by the event which sets isNVDAMenuOpen to False.
This reverts commit f6e8360ef1ea30d6b9216b5abcdf40db1549f6e0.
Re #3503.