* Fixes a persistence bug introduced in the last release that could cause deleted scripts to come back to life (oh, no, Zombie scripts!)
* Change what pin is tested to trigger "clear scripts on startup" on boards without both A and B buttons
    - on generic ESP32 boards such as the IoT-Bus Io board: use pin 26
    - on ESP8266 boards: use pin 4
    - on all other boards: do nothing now; testing a pin made it too easy to clear scripts by accident