Fix WiFi interface for static IP

Author: mlafauci

libraries/WiFi/WiFi.h

@@ -68,26 +68,17 @@ class WiFiClass
     /* Change Ip configuration settings disabling the dhcp client
         *
         * param local_ip: 	Static ip configuration
-        * param dns_server: Static DNS server configuration
+        * param gateway : 	Static gateway configuration
         */
-    void config(IPAddress local_ip, IPAddress dns_server);
+    void config(IPAddress local_ip, IPAddress gateway);
 
     /* Change Ip configuration settings disabling the dhcp client
         *
         * param local_ip: 	Static ip configuration
-        * param dns_server: Static DNS server configuration
         * param gateway: 	Static gateway configuration
+        * param subnet:		Static Subnet mask
         */
-    void config(IPAddress local_ip, IPAddress dns_server, IPAddress gateway);
-
-    /* Change Ip configuration settings disabling the dhcp client
-        *
-        * param local_ip: 	Static ip configuration
-        * param dns_server: Static DNS server configuration
-        * param gateway: 	Static gateway configuration
-        * param subnet: 	Static subnet mask configuration
-        */
-    void config(IPAddress local_ip, IPAddress dns_server, IPAddress gateway, IPAddress subnet);
+    void config(IPAddress local_ip, IPAddress gateway, IPAddress subnet);
 
     /* Change DNS Ip configuration
      *