Code clean up.

src/extras/renderers/plugins/LensFlarePlugin.js

@@ -158,8 +158,7 @@ THREE.LensFlarePlugin = function () {
 
 			flare = flares[ i ];
 
-			if (!flare.visible)
-				continue;
+			if ( flare.visible === false ) continue;
 			
 			tempPosition.set( flare.matrixWorld.elements[12], flare.matrixWorld.elements[13], flare.matrixWorld.elements[14] );