flutter: 吃子时不再画叉

实际上画叉的位置也不对，始终在棋盘左上角。
不画叉，当去掉棋子，留着阴影显示，效果也不错。

顺带升级版本到 v0.10.3

src/ui/flutter/lib/painting/pieces_painter.dart

@@ -140,13 +140,6 @@ class PiecesPainter extends PiecesBasePainter {
           break;
         case Piece.ban:
           print("pps.piece is Ban");
-          paint.color = UIColors.banBorderColor;
-          // TODO
-          paint.color = UIColors.banColor;
-          canvas.drawLine(new Offset(0, 0),
-              new Offset(pieceInnerRadius, pieceInnerRadius), paint);
-          canvas.drawLine(new Offset(pieceInnerRadius, 0),
-              new Offset(0, pieceInnerRadius), paint);
           break;
         default:
           assert(false);

src/ui/flutter/pubspec.yaml

@@ -1,7 +1,7 @@
 name: sanmill
 description: A new Flutter project.
 
-version: 0.10.2+1
+version: 0.10.3+1
 
 environment:
   sdk: ">=2.1.0 <3.0.0"