Fix possible invalid Control reference in ListBox::removeItem
Fix possible invalid Control reference in ListBox::removeItem

If a hovered item was being removed, it would not remove the sp<>
reference to it in removeItem() - it would instead remove the 'selected'
item.

This looks like a copy-paste error from the 'selected' case above.

Istrebitel/OpenApoc,steveschnepp/OpenApoc,Istrebitel/OpenApoc,pmprog/OpenApoc,steveschnepp/OpenApoc,pmprog/OpenApoc