Hardwareserial flush TX only

[bertmelis]

arduino-esp32/cores/esp32/esp32-hal-uart.c

Line 362 in 4d98cea

uartFlushTxOnly(uart,false);

flush TX only should only flush TX.

This false should be true.

[bertmelis]

#4263

[bertmelis]

Please solve this one. It's a small mistake with breaking consequences.

It'd be a shame if this slips into a release.

[Miq1]

@bertmelis CI has been fixed an hour ago, so you may close and reopen your PR to pass.

[bertmelis]

Merged master branch into the PR. CI passed now.

Could someone please look into this? This error is so obvious but has breaking consequences.