Refactor some clippy-pedantic errors

src/board/fen.rs

@@ -62,7 +62,7 @@ pub fn piece_placement(pieces: &str) -> Result<Board, FenError> {
                 ))
             }
         } {
-            board.set_piece(Piece::new(1 << square, piece_type, color));
+            board.set_piece(&Piece::new(1 << square, piece_type, color));
             file += 1;
         };
     }