JS: Update a test

Author: asgerf

javascript/ql/test/ApiGraphs/dynamic-prop-read/index.js

@@ -2,4 +2,4 @@ const MyStream = require('classes').MyStream;
 
 var s = new MyStream();
 for (let m of ["write"])
-    s[m]("Hello, world!"); /* use=moduleImport("classes").getMember("exports").getMember("MyStream").getInstance().getUnknownMember() */
+    s[m]("Hello, world!"); /* use=moduleImport("classes").getMember("exports").getMember("MyStream").getInstance().getArrayElement() */