JS: Update new xsjs-specific code to respect TEarlyStageNode

Author: asgerf

javascript/ql/lib/semmle/javascript/NodeJS.qll

@@ -309,10 +309,10 @@ private predicate isRequire(EarlyStageNode nd) {
   // `$.require('underscore');`.
   // NPM as supported in [XSJS files](https://www.npmjs.com/package/@sap/async-xsjs#npm-packages-support).
   exists(MethodCallExpr require |
-    nd.getFile().getExtension() = ["xsjs", "xsjslib"] and
+    require.getFile().getExtension() = ["xsjs", "xsjslib"] and
     require.getCalleeName() = "require" and
     require.getReceiver().(GlobalVarAccess).getName() = "$" and
-    nd = require.getCallee().flow()
+    nd = TValueNode(require.getCallee())
   )
 }