Update canvas_lines_colors_2d.html

Removes a runtime error in `onWindowResize()`. `composer` is not defined.

examples/canvas_lines_colors_2d.html

@@ -140,8 +140,6 @@
 
 				renderer.setSize( window.innerWidth, window.innerHeight );
 
-				composer.reset();
-
 			}
 
 			function onDocumentMouseMove( event ) {