webvr_vive_paint: removed no longer needed workaround.

examples/webvr_vive_paint.html

@@ -246,7 +246,7 @@
 				line.frustumCulled = false;
 				line.castShadow = true;
 				line.receiveShadow = true;
-				// scene.add( line );
+				scene.add( line );
 
 				// Shapes
 
@@ -401,8 +401,6 @@
 
 					if ( controller.getButtonState( 'trigger' ) ) {
 
-						if ( line.parent === null ) scene.add( line );
-
 						stroke( point1, point2, matrix1, matrix2 );
 
 					}