Update javascript/ql/src/experimental/SockJS/SockJS.qll

do not import specific libs

Co-Authored-By: Erik Krogh Kristensen <erik-krogh@github.com>

Author: kyprizel

javascript/ql/src/experimental/SockJS/SockJS.qll

@@ -3,7 +3,6 @@
  */
 
 import javascript
-import DataFlow::PathGraph
 
 /**
  * A model of the `SockJS` websocket data handler (https://sockjs.org).