Fix deletion of items in pcbnew

Ensures the fallthrough generic deletion code path increments
the deleted items counter.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/17798

pcbnew/tools/edit_tool.cpp

@@ -2425,6 +2425,7 @@ void EDIT_TOOL::DeleteItems( const PCB_SELECTION& aItems, bool aIsCut )
         default:
             wxASSERT_MSG( parentFP == nullptr, wxT( "Try to delete an item living in a footprint" ) );
             commit.Remove( board_item );
+            itemsDeleted++;
             break;
         }
     }