fix description of scrolling west in the test

Author: brandonaaron

test/index.html

@@ -136,7 +136,7 @@
                     if (event.deltaX > 0)
                         o += ' east (' + event.deltaX + ')';
                     else if (event.deltaX < 0)
-                        o += ' south (' + event.deltaX + ')';
+                        o += ' west (' + event.deltaX + ')';
 
                     o += ' deltaFactor (' + event.deltaFactor + ')';