MenuToolGroup: Add some missing styles for tools' 'check' icons
MenuToolGroup: Add some missing styles for tools' 'check' icons

These should come from IconElement, but we're not using IconElement
correctly here (and we can't because toolbars are bonkers).

Bug: T109995
Change-Id: I598e7b25a47ae6e494475c8cf082bce016999dab

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