fix(flutter): 调整分类弧线开口方向

lib/pages/discover/discover_view.dart

@@ -573,8 +573,8 @@ class CategoryUnderlinePainter extends CustomPainter {
       ..strokeWidth = _categoryUnderlineStrokeWidth
       ..strokeCap = StrokeCap.round;
     final path = Path()
-      ..moveTo(1, size.height - 1)
-      ..quadraticBezierTo(size.width / 2, 0, size.width - 1, size.height - 1);
+      ..moveTo(1, 1)
+      ..quadraticBezierTo(size.width / 2, size.height + 1, size.width - 1, 1);
     canvas.drawPath(path, paint);
   }