Check proper behavior of `preserve_dios` during fake deep sleep

[dhalbert]

Not clear if preserve_dios works properly in fake deep sleep. Also, what happens to pins on wakeup? Looks like they get reset early, and there may be a significant delay before the user can wrest control again, due to possible wifi autoconnect.

• Also see espressif: Pins preserved during deep-sleep cannot be toggled after wakeup #9622.