test__author_queried_object_fix doesn't need to initialise wp_rewrite

The test [`test__author_queried_object_fix`](https://github.com/Automattic/Co-Authors-Plus/blob/master/tests/test-author-queried-object.php) doesn't need to use `wp_rewrite`. It passes without it. What does it even have to do with the feature being tested?

Open tests/test-author-queried-object.php and find test__author_queried_object_fix plus its wp_rewrite initialization. Run that test before and after removing the unnecessary setup; done means the test still passes without initializing wp_rewrite.

Written by the indexing model from the issue text.