Tests_WP_MS_Sites_List_Table test fails when run on their own

[xrmx]

If i run the following command:

phpunit --filter Tests_WP_MS_Sites_List_Table -c tests/phpunit/multisite.xml

tests will fail with this message

Undefined index: hook_suffix

/srv/www/wordpress-develop/src/wp-admin/includes/class-wp-screen.php:229
/srv/www/wordpress-develop/src/wp-admin/includes/template.php:2029
/srv/www/wordpress-develop/src/wp-admin/includes/class-wp-list-table.php:143
/srv/www/wordpress-develop/src/wp-admin/includes/class-wp-ms-sites-list-table.php:48
/srv/www/wordpress-develop/src/wp-admin/includes/list-table.php:53
/srv/www/wordpress-develop/tests/phpunit/tests/multisite/wpMSSitesListTable.php:19

[desrosj]

Fixes issue with test failing when called directly.

[desrosj]

Patch fixes the issue by including the second parameter for _get_list_table(). There was one other test class where _get_list_table() was being called. I modified that test to use the second parameter instead of setting the global for consistency.

[johnbillion]

In 39481:

Build/Test Tools: Correctly set up the current screen during list table tests so that they don't fail when run individually.

Props desrosj
Fixes #38761