In `get_sample_permalink_html()`, `$view_link` is set and never used.

See #27882.



git-svn-id: https://develop.svn.wordpress.org/trunk@28302 602fd350-edb4-49c9-b593-d223f7449a82
In `WP_Screen::render_screen_options()`, remove dead code:

* `$wp_list_table` does not need to be imported.
* `$post` is set and never used.

See #27882.


git-svn-id: https://develop.svn.wordpress.org/trunk@28303 602fd350-edb4-49c9-b593-d223f7449a82