Show the knight in the zero position

Signed-off-by: Denis Kozadaev <denis@dilos.org>

src/gameboard.cpp

@@ -112,7 +112,7 @@ GameBoard::redrawMap()
 	for (pos = 0, y = oy; y < h; y += dy) {
 		for (x = ox; x < w; x += dx) {
 			p->drawRect(x, y, dx, dy);
-			if (isEnabled() && (kpos > 0) && (kpos == pos) &&
+			if (isEnabled() && (kpos >= 0) && (kpos == pos) &&
 				IS_SET(config, CFG_KNIGHT)) {
 				/* draw the knight */
 				p->drawPixmap(x, y, *kxpm);