vpn: call log_disconnect on disestablish event

ffstatus/server.py

@@ -359,7 +359,7 @@ class BatcaveHttpRequestHandler(BaseHTTPRequestHandler):
                     key, peername, remote, gateway, timestamp)
 
             elif action == 'disestablish':
-                self.server.storage.log_vpn_connect(key, gateway, timestamp)
+                self.server.storage.log_vpn_disconnect(key, gateway, timestamp)
 
             else:
                 self.logger.error('Unknown VPN action \'%s\' not filtered.',