MediaWiki theme: Add hover state to listToolGroup
MediaWiki theme: Add hover state to listToolGroup

Selected: #eee -> #d0d0d0
Highlighted: transparent -> #eeeeee

Bug: T78082
Change-Id: Ib26bb607c60856ccaa5884e0fd4d3e4cddebd1e2

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