[ESP32 Serial] Fix serial tasks not working after save or restart task #4751
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[ESP32 Serial] Do not cache baud rate between end() and begin()
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A previous work-around for ESP32 was now working against us as it did prevent calling
begin()when the pins did not change.However if
end()was called on HW serial on ESP32, you really need to callbegin()or else the serial port will not work anymore.