Shorter BTT board names (for LCD info) (#18139)

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_1.h

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_3.h

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h

Marlin/src/pins/lpc1769/pins_BTT_SKR_V1_4_TURBO.h

Marlin/src/pins/stm32f1/pins_BTT_SKR_E3_DIP.h

Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_V1_0.h

Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_V1_2.h

Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_V2_0.h

Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_V1_1.h

Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h

Marlin/src/pins/stm32f4/pins_BTT_GTR_V1_0.h

Marlin/src/pins/stm32f4/pins_BTT_SKR_PRO_V1_1.h