micropython: increase REPL history to 32 lines

components/micropython/vendor/ports/esp32/mpconfigport.h

@@ -56,6 +56,7 @@
 #define MICROPY_USE_INTERNAL_PRINTF         (0) // ESP32 SDK requires its own printf
 #define MICROPY_SCHEDULER_DEPTH             (8)
 #define MICROPY_VFS                         (1)
+#define MICROPY_READLINE_HISTORY_SIZE       (32)
 
 // control over Python builtins
 #define MICROPY_PY_STR_BYTES_CMP_WARN       (1)