Clean up pins self-checks

Marlin/src/pins/mega/pins_MEGACONTROLLER.h

Marlin/src/pins/mega/pins_MINITRONICS.h

Marlin/src/pins/ramps/pins_AZTEEG_X3.h

Marlin/src/pins/ramps/pins_AZTEEG_X3_PRO.h

Marlin/src/pins/ramps/pins_FORMBOT_RAPTOR.h

Marlin/src/pins/ramps/pins_FORMBOT_TREX2PLUS.h

Marlin/src/pins/ramps/pins_FORMBOT_TREX3.h

Marlin/src/pins/ramps/pins_RUMBA.h

Marlin/src/pins/ramps/pins_TRONXY_V3_1_0.h

Marlin/src/pins/ramps/pins_Z_BOLT_X_SERIES.h

Marlin/src/pins/stm32/pins_ARMED.h

Marlin/src/pins/stm32/pins_BIGTREE_SKR_PRO_V1.1.h

Marlin/src/pins/stm32/pins_BLACK_STM32F407VE.h

Marlin/src/pins/stm32/pins_MKS_ROBIN.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_MINI.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_NANO.h

Marlin/src/pins/stm32/pins_RUMBA32.h

Marlin/src/pins/stm32/pins_STM32F4.h

Marlin/src/pins/stm32/pins_THE_BORG.h