Use correct default value for $domain argument in setcookie() #2800
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$domainshould be a string and not null to avoid the PHP 8.2 deprecation: setcookie():Passing null to parameter #5 ($domain) of type string is deprecated
Introduced in b343d48 / https://core.trac.wordpress.org/changeset/29478.
Trac ticket: https://core.trac.wordpress.org/ticket/54914
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.