dns: worldwidedns: Fix create_zone() reseller suppport

The "DYN" parameter is only defined for non-resellers:
    https://www.worldwidedns.net/dns_api_protocol_new_domain.asp

The "ID" parameter is only defined for resellers:
    https://www.worldwidedns.net/dns_api_protocol_new_domain_reseller.asp

Author: Aaron Sierra

libcloud/dns/drivers/worldwidedns.py

@@ -330,10 +330,12 @@ def create_zone(self, domain, type="master", ttl=None, extra=None):
         else:
             dyn = 1
         params = {"DOMAIN": domain, "TYPE": _type}
-        action = "/api_dns_new_domain.asp"
 
-        if self.reseller_id is not None:
+        if self.reseller_id is None:
             params["DYN"] = dyn
+            action = "/api_dns_new_domain.asp"
+        else:
+            params["ID"] = self.reseller_id
             action = "/api_dns_new_domain_reseller.asp"
         self.connection.request(action, params=params)
         zone = self.get_zone(domain)