fix: Change incorrect domain for domain lists

lib/logic/api_maps/rest_maps/dns_providers/digital_ocean_dns/digital_ocean_dns.dart

@@ -238,12 +238,11 @@ class DigitalOceanDnsApi extends DnsProviderApi {
 
   @override
   Future<List<String>> domainList() async {
-    final String url = '$rootAddress/domains';
     List<String> domains = [];
 
     final Dio client = await getClient();
     try {
-      final Response response = await client.get(url);
+      final Response response = await client.get('/domains');
       domains = response.data['domains']
           .map<String>((final el) => el['name'] as String)
           .toList();