Clear mini editor base select list cancelled()
Clear mini editor base select list cancelled()

Clearing the mini editor when closing is something
all sub-classes were already doing so it makes sense
to pull it up to the base class as the default
cancelled() implementation that can still be overridden
if needed.

changjej/symbols-view,atom/symbols-view,rodumani/symbols-view,kainwinterheart/symbols-view,spencerlyon2/symbols-view,rodumani/symbols-view,changjej/symbols-view,harai/atom-gnu-global,spencerlyon2/symbols-view,harai/atom-gnu-global