Replace `is_super_admin()` check when setting up multisite
|Reported by:||flixos90||Owned by:||flixos90|
|Component:||Networks and Sites||Keywords:||needs-patch|
When setting up multisite, an is_super_admin() check is made in populate_network(). As discussed with @johnbillion at WordCamp Torino, that check can easily be removed, and instead the previous query can be adjusted to query users with the administrator role only.
This ticket is part of the #37616 task and is described in https://core.trac.wordpress.org/ticket/37616#comment:62.