Broadcast advanced-select:change from the root element

[ulsyemr]

Adds a second event so host apps can react to a selection without digging
through the DOM, and fixes a case where no event fired at all.

What changes

dispatchValueChange now also dispatches advanced-select:change on the root
element, bubbling, carrying the whole selection:

{ name: "record[item_ids][]", value: ["7", "3"], options: [...] }