one some pages, menu never disappears

branched from #1360030: dpms.menus[settings_id] is undefined when more than one dynamic menu defined, prevents submenus from hiding after timeout

affects all versions

(1) you have a page a, and page b, and a page c
(2) your menu structure looks like this
-(menu root)
--a
---b
---c

(3) When you are on the home page, b and c become visible only when you hover over a, and stay visible for the period defined by the timeout attribute.
(4) When you navigate to either page b or c, b and c are *always* visible on the dynamic menu.