feat: update error message

app/config/errors.php

@@ -546,7 +546,7 @@ return [
     ],
     Exception::DOMAIN_FORBIDDEN => [
         'name' => Exception::DOMAIN_FORBIDDEN,
-        'description' => 'The requested domain is not available for the current project.',
+        'description' => 'The requested domain cannot be used as a custom domain.',
         'code' => 403,
     ],
     Exception::VARIABLE_NOT_FOUND => [

app/workers/deletes.php

@@ -683,7 +683,7 @@ class DeletesV1 extends Worker
         $consoleDB = $this->getConsoleDB();
 
         // If domain has certificate generated
-        if (isset($document['$id'])) {
+        if (isset($document['certificateId'])) {
             $domainUsingCertificate = $consoleDB->findOne('domains', [
                 Query::equal('certificateId', [$document['certificateId']])
             ]);