renamed to BUTTON0 and BUTTON1 for consistency and not to break code

As mentioned by @RetiredWizard in #8787 (comment) it is best to keep the old descriptors

Author: kreier

ports/espressif/boards/lilygo_ttgo_tdisplay_esp32_4m/pins.c

@@ -4,10 +4,10 @@
 STATIC const mp_rom_map_elem_t board_module_globals_table[] = {
     CIRCUITPYTHON_BOARD_DICT_STANDARD_ITEMS
 
-    { MP_ROM_QSTR(MP_QSTR_BUTTON_L), MP_ROM_PTR(&pin_GPIO0) },
+    { MP_ROM_QSTR(MP_QSTR_BUTTON0), MP_ROM_PTR(&pin_GPIO0) },
     { MP_ROM_QSTR(MP_QSTR_IO0), MP_ROM_PTR(&pin_GPIO0) },
 
-    { MP_ROM_QSTR(MP_QSTR_BUTTON_R), MP_ROM_PTR(&pin_GPIO35) },
+    { MP_ROM_QSTR(MP_QSTR_BUTTON1), MP_ROM_PTR(&pin_GPIO35) },
     { MP_ROM_QSTR(MP_QSTR_IO35), MP_ROM_PTR(&pin_GPIO35) },
 
     { MP_ROM_QSTR(MP_QSTR_IO2), MP_ROM_PTR(&pin_GPIO2) },