Results 2 issues of Gennadii

`exctract.cc` has typo in row 12: `#include "libcbdetect/boards_from_cornres.h"` instead of `#include "libcbdetect/boards_from_corners.h"`

## Have you checked borgbackup docs, FAQ, and open GitHub issues? Yes ## Is this a BUG / ISSUE report or a QUESTION? Bug ## System information. For client/server mode...

bug
hardware-issue