Update jquery.flot.navigate.js

BUGFIX navigation wheel scrolls page.

jquery.flot.navigate.js

@@ -135,6 +135,7 @@ Licensed under the MIT License ~ http://threedubmedia.googlecode.com/files/MIT-L
         }
 
         function onMouseWheel(e, delta) {
+            e.preventDefault();
             onZoomClick(e, delta < 0);
             return false;
         }