Update field_proxy_forwarder.py

Author: poorva1209

gridappsd-field-bus-lib/gridappsd_field_bus/field_interface/field_proxy_forwarder.py

@@ -113,7 +113,7 @@ def on_message_from_ot(self, headers, message):
             if headers["destination"] == topics.field_input_topic():
                 self.proxy_connection.send(topics.field_input_topic(),json.dumps(message))
 
-            if 'goss.gridappsd.field' in headers["destination"]:
+            elif 'goss.gridappsd.field' in headers["destination"]:
 
                 self.proxy_connection.send(headers["destination"],json.dumps(message))
             else: