Fix Ender-2 display pins, add BTN_ENC (#16349)

Marlin/Configuration.h

Marlin/src/inc/Conditionals_LCD.h

Marlin/src/inc/Conditionals_post.h

Marlin/src/inc/SanityCheck.h

Marlin/src/lcd/dogm/u8g_dev_uc1701_mini12864_HAL.cpp

Marlin/src/lcd/dogm/ultralcd_DOGM.h

Marlin/src/pins/linux/pins_RAMPS_LINUX.h

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_1.h

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_3.h

Marlin/src/pins/sanguino/pins_MELZI_CREALITY.h

Marlin/src/pins/stm32/pins_BTT_SKR_E3_DIP.h

Marlin/src/pins/stm32/pins_BTT_SKR_MINI_E3.h

Marlin/src/pins/stm32/pins_MKS_ROBIN_PRO.h

config/default/Configuration.h

config/examples/3DFabXYZ/Migbot/Configuration.h

config/examples/ADIMLab/Gantry v1/Configuration.h

config/examples/ADIMLab/Gantry v2/Configuration.h

config/examples/AlephObjects/TAZ4/Configuration.h

config/examples/Alfawise/U20-bltouch/Configuration.h

config/examples/Alfawise/U20/Configuration.h