Ativate delete tool so it can display the selection clarification menu when needed.

Fixes: lp:1835371
* https://bugs.launchpad.net/kicad/+bug/1835371

pcbnew/tools/edit_tool.cpp

@@ -805,6 +805,7 @@ int EDIT_TOOL::Remove( const TOOL_EVENT& aEvent )
         return 1;
 
     std::vector<BOARD_ITEM*> lockedItems;
+    Activate();
 
     // get a copy instead of reference (as we're going to clear the selection before removing items)
     PCBNEW_SELECTION selectionCopy;