POSLIB_FLAG_EVENT overflow in callback event_id

[sforconi]

In file poslib.h:
the event: POSLIB_FLAG_EVENT_LED_OFF is defined as POSLIB_FLAG_EVENT_LED_OFF = 256,
but in the callback function: poslib_events_listen_info_f, called at line 228 in poslib_event.c,
the callback argument structure POSLIB_FLAG_EVENT_info_t, has the event_id field defined as uint8_t, thus the value 256 will be trucated to 0, remapping onto POSLIB_FLAG_EVENT_NONE.