eeschema: Fix list invalidation

When removing a junction, we need to keep the next pointer for deleted
item, marking them with a flag until committed.

Fixes: lp:1837398
* https://bugs.launchpad.net/kicad/+bug/1837398

eeschema/bus-wire-junction.cpp

@@ -745,7 +745,6 @@ void SCH_EDIT_FRAME::DeleteJunction( SCH_ITEM* aJunction, bool aAppend )
     {
         aItem->SetFlags( STRUCT_DELETED );
         itemList.PushItem( ITEM_PICKER( aItem, UR_DELETED ) );
-        RemoveFromScreen( aItem );
     };
 
     remove_item( aJunction );