JavaScript: Remove --platform node extractor options.

javascript/ql/test/query-tests/NodeJS/DubiousImport/f.js

@@ -4,5 +4,4 @@
 	module.exports = me;
 }(module));
 
-// semmle-extractor-options: --platform
-// semmle-extractor-options: node
+require("process"); // ensure this is treated as Node.js code

javascript/ql/test/query-tests/NodeJS/UnusedDependency/src/other.js

@@ -1,4 +1,2 @@
 import hipsterness from 'react';
 import curry from 'lodash/function/curry';
-
-//semmle-extractor-options: --platform node

javascript/ql/test/query-tests/Security/CWE-089/untyped/tst4.js

@@ -7,5 +7,3 @@ angular.module('myApp', ['ngRoute'])
 .controller('FindPost', function($routeParams) {
   db.get('SELECT * FROM Post WHERE id = "' + $routeParams.id + '"');
 });
-
-// semmle-extractor-options: --platform node

javascript/ql/test/query-tests/Statements/ReturnOutsideFunction/node.js

@@ -1,5 +1,4 @@
 // not a syntax error, but still NOT OK
 return 42;
 
-// semmle-extractor-options: --platform
-// semmle-extractor-options: node
+require("path") // ensure this is treated as Node.js code