fix(scrolling): fix overflow scrolling when side menu and main content both use overflow scrolling. Closes 2201

js/angular/directive/sideMenuContent.js

@@ -126,7 +126,7 @@ function($timeout, $ionicGesture, $window) {
               return scrollAxis;
             }
           }
-          return 'x';
+          return 'y';
         }
 
         var content = {