Adding line that was accidentally removed in the previous commit.

src/CanvasItems.vala

@@ -286,6 +286,7 @@ public class CanvasItems {
   private CanvasItem create_pencil( bool loading = false ) {
     var item = new CanvasItemPencil( _canvas, props );
     if( !loading ) {
+      _active = item;
       _canvas.set_cursor_from_name( "pencil" );
     }
     return( item );