fix incorrect touch action pan direction

if i want to intercept/handle horizontal pans/swipes, i need `pan-y`,
not `pan-x` (as touch-action determines which default actions the
browser should handle - if i wanted to do my own horizontal pans/swipes,
i DON'T want the browser to handle `pan-x`). the fact that this code
seems to currently work regardless may be due to other logic in the
script, like the part where `touch-action` is combined...

src/recognizers/pan.js

@@ -27,10 +27,10 @@ inherit(PanRecognizer, AttrRecognizer, {
         var direction = this.options.direction;
         var actions = [];
         if (direction & DIRECTION_HORIZONTAL) {
-            actions.push(TOUCH_ACTION_PAN_X);
+            actions.push(TOUCH_ACTION_PAN_Y);
         }
         if (direction & DIRECTION_VERTICAL) {
-            actions.push(TOUCH_ACTION_PAN_Y);
+            actions.push(TOUCH_ACTION_PAN_X);
         }
         return actions;
     },