Convert comma to semicolon in variable assignment in webgl_effects_stereo

examples/webgl_effects_stereo.html

@@ -118,8 +118,8 @@
 
 			function onWindowResize() {
 
-				windowHalfX = window.innerWidth / 2,
-				windowHalfY = window.innerHeight / 2,
+				windowHalfX = window.innerWidth / 2;
+				windowHalfY = window.innerHeight / 2;
 
 				camera.aspect = window.innerWidth / window.innerHeight;
 				camera.updateProjectionMatrix();