MediaWiki Theme: Adjust MenuOptionWidget selected state
MediaWiki Theme: Adjust MenuOptionWidget selected state

Affects:
* DropdownWidget
* ComboBoxWidget
* LookupElement

(And hopefully nothing else.)

Change-Id: I4079d19e4f37b9785eed195a5e1f035424a0d03b

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui