fix gtTurnNumber and isTurnWhite ; now works correctly

src/backend/Board.java

@@ -28,11 +28,11 @@ public class Board {
     }
 
     public int getTurnNumber() {
-        return 0;
+        return turnNumber;
     }
 
     public boolean isTurnWhite() {
-        return false;
+        return turnWhite;
     }
 
     public void setPiece(boolean isWhite, PieceType type, int x, int y) {