hosts/windows: use the port when connecting

plugins/commands/rdp/command.rb

@@ -26,9 +26,7 @@ module VagrantPlugins
           end
 
           rdp_info = get_rdp_info(machine)
-          if !rdp_info
-            raise Errors::RDPUndetected
-          end
+          raise Errors::RDPUndetected if !rdp_info
 
           @env.host.capability(:rdp_client, rdp_info)
         end

plugins/hosts/windows/cap/rdp.rb

@@ -10,8 +10,7 @@ module VagrantPlugins
           config = nil
           opts   = {
             "drivestoredirect:s"       => "*",
-            "full address:s"           => rdp_info[:host],
-            "port:i"                   => rdp_info[:port],
+            "full address:s"           => "#{rdp_info[:host]}:#{rdp_info[:port]}",
             "prompt for credentials:i" => "1",
             "username:s"               => rdp_info[:username],
           }