fix(tools): Fix idf_monitor output line
fix(tools): Fix idf_monitor output line

Tool monitor should output one character not one line.

espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK,espressif/ESP8266_RTOS_SDK