Update pins.c to add BOOT button

Currently the BOOT button is not defined as it is on most board. Added BUTTON & D0 aliases for the GPIO0 pin.

Author: Timeline8

ports/espressif/boards/waveshare_esp32_s3_zero/pins.c

@@ -9,6 +9,10 @@
 static const mp_rom_map_elem_t board_module_globals_table[] = {
     CIRCUITPYTHON_BOARD_DICT_STANDARD_ITEMS
 
+    // BOOT button labeled simply as "B" om silkscreen
+    { MP_ROM_QSTR(MP_QSTR_BUTTON), MP_ROM_PTR(&pin_GPIO0) },
+    { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_GPIO0) },
+    
     // Top side of the board - left column
     // (top to bottom, preceded by 5V, GND & 3.3V)
     { MP_ROM_QSTR(MP_QSTR_IO1), MP_ROM_PTR(&pin_GPIO1) },