fix: incorrect use of Config class. (#2317)

The config class was used incorrectly to load the resultserver ip resulting in an error at db.add_machine because an empy Config object cannot be casted into the required type

modules/machinery/aws.py

@@ -109,7 +109,7 @@ def _allocate_new_machine(self):
         # machine, else use the default value.
         interface = autoscale_options["interface"] if autoscale_options.get("interface") else machinery_options.get("interface")
         resultserver_ip = (
-            autoscale_options["resultserver_ip"] if autoscale_options.get("resultserver_ip") else Config("cuckoo:resultserver:ip")
+            autoscale_options["resultserver_ip"] if autoscale_options.get("resultserver_ip") else Config().get("resultserver").get("ip")
         )
         if autoscale_options.get("resultserver_port"):
             resultserver_port = autoscale_options["resultserver_port"]