Changing SSID of ESP8266

#### Issue details
_Mission Planner is no longer able to change the SSID of ESP8266 WiFi devices. The SSID comes of greyed out.

#### Version
_What version was the issue encountered with_

#### Platform
[ x ] All
[ ] AntennaTracker
[ ] Copter
[ ] Plane
[ ] Rover
[ ] Sub

#### Airframe type
_What type of airframe (flying wing, glider, hex, Y6, octa etc)_

#### Hardware type
_What autopilot hardware was used? (pixhawk, pixracer, PX4FMU etc)_

#### Logs
_Please provide a link to any relevant logs that show the issue_

Start by reproducing the greyed-out SSID behavior in Mission Planner with an ESP8266 WiFi device; the issue names no source file, test, version, or log to use as an entry point. Trace the SSID setting workflow and confirm that the control becomes editable and successfully changes the device SSID.

Written by the indexing model from the issue text.