MEEB cleanup, whitespace

.github/workflows/test-builds.yml

Marlin/src/pins/pins.h

buildroot/share/PlatformIO/scripts/STM32F103RC_MEEB_3DP.py

...PlatformIO/scripts/STM32F103RC_MEEB_3DP_create_variant.py

buildroot/share/PlatformIO/variants/MEEB_3DP/board.cpp

...root/share/PlatformIO/variants/MEEB_3DP/ld/stm32f103rb.ld

...root/share/PlatformIO/variants/MEEB_3DP/ld/stm32f103rc.ld

...root/share/PlatformIO/variants/MEEB_3DP/ld/stm32f103re.ld

...hare/PlatformIO/variants/MEEB_3DP/wirish/boards_setup.cpp

buildroot/share/tests/STM32F103RC_meeb-tests

platformio.ini