Cannot access the mounted element from document

Unable to query the mounted element from `document` while it is accessible from `$rootElement`.

### How to reproduce?

```javascript
import angular from 'angular';
import { mount } from 'cypress-angularjs-unit-test';

it('should find the element from document', (done) => {
const module = angular.module('app', []);

module.run(($timeout, $rootElement) => {
console.log($rootElement[0].querySelector('.target')); //

console.log(document.querySelector('.target')); // null

$timeout(() => {
console.log($rootElement[0].querySelector('.target')); //

console.log(document.querySelector('.target')); // null

done();
});
});

mount('

', ['app']);

console.log(document.querySelector('.target')); // null
});
```

### Expected behavior

Should able to access the mounted element from `document`.

Start by running the supplied Cypress test and tracing the mount entry point, comparing the mounted element’s $rootElement location with document.querySelector('.target'). Check the AngularJS module.run timing and the document state before and after mount. Done means the mounted element is discoverable through document.querySelector in both shown checks.

Written by the indexing model from the issue text.