ESP8266: Fix partial erase of connection settings (#1150)

* Fix partial erase of connection settings

#1149

* Update WM version and add disconnect

platformio.ini

@@ -112,7 +112,7 @@ ahtx0 = Adafruit AHTX0
 ina226 = https://github.com/jarzebski/Arduino-INA226.git#968a684
 a6lib = https://github.com/h2zero/A6lib
 wifimanager32 = https://github.com/tzapu/WiFiManager.git#c3ff582
-wifimanager8266 = https://github.com/tzapu/WiFiManager.git#0.16.0
+wifimanager8266 = https://github.com/tzapu/WiFiManager.git#2.0.5-beta
 ethernet = Ethernet
 esp8266_mdns = esp8266_mdns
 wire = Wire