test: adapt for @hoodie/account-client@5

BREAKING CHANGE:

Before

```js
var account = new Account(options)
alert("Ohaj, " + account.username)
```

Now

```js
var account = new Account(options)
account.ready.then(function () {
  alert("Ohaj, " + account.username)
})
```"

test/integration/constructor-test.js

@@ -10,8 +10,9 @@ test('new HoodieAdmin(options)', function (t) {
   simple.mock(global, 'location', {origin: 'http://example.com'})
   var account = new Account()
 
-  t.is(account.username, 'admin', 'sets username from localStorage')
-
-  simple.restore()
-  t.end()
+  account.ready.then(function () {
+    simple.restore()
+    t.is(account.username, 'admin', 'sets username from localStorage')
+    t.end()
+  })
 })