adapter can hang until power cycled after being reset

[delan]

when resetting the adapter, the firmware can start getting stuck in Adafruit_SSD1306::begin or the initial Adafruit_SSD1306::display (pico led on), until the adapter is power cycled. this is especially likely to happen if you mash the reset button several times in quick succession. stack trace:

our 4pin i2c display (U2) doesn’t expose RES#, so we need to switch U2.VCC externally.