Board: make starting_pos a const variable instead

src/allocs.rs

@@ -22,7 +22,7 @@ pub fn run() {
         },
     );
 
-    let mut board = Board::new().starting_pos();
+    let mut board = Board::STARTING_POSITION;
     let mut rng = rand::rng();
     let mut i = 0;
     while board.game_winner() == Winner::None && i < 2 {