Fix Unassigned: Explicitly set ServerName since default value is the system hostname which is also registered in Hestia as the first domain

install/deb/apache2/unassigned.conf

@@ -1,12 +1,12 @@
 <VirtualHost directIP:directPORT>
-  
+    ServerName directIP
     DocumentRoot /var/www/html/
     Alias /error/ /var/www/document_errors/
 
 </VirtualHost>
 
 <VirtualHost directIP:directSSLPORT>
-  
+    ServerName directIP
     DocumentRoot /var/www/html/
     Alias /error/ /var/www/document_errors/