add cleanFS into user config and correct missing rf315 subject subscribe

tests/Test_config.h

@@ -52,6 +52,7 @@ char mqtt_port[6] = "1883";
 //#define ESPWifiManualSetup true //uncomment you don't want to use wifimanager for your credential settings on ESP
 #define WifiManager_password "your_password"
 //#define MDNS_SD //comment if you don't want to use mdns for discovering automatically your ip server, please note that MDNS with ESP32 can cause the BLE to not work
+//#define cleanFS //uncomment if you want to clean the ESP memory and reenter your credentials
 
 //set minimum quality of signal so it ignores AP's under that quality
 #define MinimumWifiSignalQuality 8