Fix system info class creation

Hostapd.php is throwing an error.
Two problems found:
1) the class System is not existing. Its actually called Sysinfo
2) the namespace of the class is RaspAP\System

includes/hostapd.php

@@ -14,7 +14,7 @@ getWifiInterface();
 function DisplayHostAPDConfig()
 {
     $status = new StatusMessages();
-    $system = new System();
+    $system = new \RaspAP\System\Sysinfo;
     $arrConfig = array();
     $arr80211Standard = [
         'a' => '802.11a - 5 GHz',