Tweak serial output code

Marlin/src/HAL/HAL_STM32F7/TMC2660.cpp

Marlin/src/feature/bedlevel/ubl/ubl.cpp

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

Marlin/src/feature/mixing.cpp

Marlin/src/feature/pause.cpp

Marlin/src/gcode/control/M605.cpp

Marlin/src/gcode/parser.cpp

Marlin/src/gcode/queue.cpp

Marlin/src/module/configuration_store.cpp

Marlin/src/module/endstops.cpp