Dear correcly with backspace

[lpatiny]

When we hit the 'DEL' key in the serial mode it is actually appended to the string rather than remove the last character.

This could be improved in this part of the code:

esp32-c3/lib/hack/taskSerial.cpp

Lines 25 to 34 in bd312cd

	if (inChar == 13 || inChar == 10) {
	// this is a carriage return;
	if (serialBufferPosition > 0) {
	printResult(serialBuffer, &Serial);
	}
	serialBufferPosition = 0;
	serialBuffer[0] = '\0';
	} else {
	if (serialBufferPosition < SERIAL_BUFFER_LENGTH) {
	serialBuffer[serialBufferPosition] = inChar;