test: change the regluar express

update the test/parallel/test-vm-create-context-arg.js
in line 27 to change the regluar expression `TypeError`
with the `/^TypeError: sandbox must be an object$/`

Author: AkiraXue

test/parallel/test-vm-create-context-arg.js

@@ -26,7 +26,7 @@ const vm = require('vm');
 
 assert.throws(function() {
   vm.createContext('string is not supported');
-}, TypeError);
+}, /^TypeError: sandbox must be an object$/);
 
 assert.doesNotThrow(function() {
   vm.createContext({ a: 1 });