Fix a typo in Dialog

sky/tests/widgets/dialog-expected.txt

Index: sky/tests/widgets/dialog-expected.txt
diff --git a/sky/tests/widgets/dialog-expected.txt b/sky/tests/widgets/dialog-expected.txt
index 0c76eb7d078abc1b03524fc5ad16e0bd8e83b6d7..8866325791cbc4039fca0380fd0148983ed93e0c 100644
--- a/sky/tests/widgets/dialog-expected.txt
+++ b/sky/tests/widgets/dialog-expected.txt
@@ -13,12 +13,14 @@ PAINT FOR FRAME #2 ----------------------------------------------
 2 |  |  | drawRect(Rect.fromLTRB(0.0, 0.0, 800.0, 600.0), Paint(Color(0x7f000000)))
 2 |  | paintChild RenderPositionedBox at Point(0.0, 0.0)
 2 |  |  | TestDisplayList() constructor: 800.0 x 600.0
-2 |  |  | paintChild RenderConstrainedBox at Point(260.0, 284.0)
+2 |  |  | paintChild RenderConstrainedBox at Point(260.0, 276.0)
 2 |  |  |  | TestDisplayList() constructor: 800.0 x 600.0
 2 |  |  |  | drawRRect(Instance of 'RRect', Paint(Color(0xfffafafa)))
 2 |  |  |  | paintChild RenderParagraph at Point(0.0, 0.0)
 2 |  |  |  |  | TestDisplayList() constructor: 800.0 x 600.0
 2 |  |  |  | paintChild RenderParagraph at Point(0.0, 16.0)
 2 |  |  |  |  | TestDisplayList() constructor: 800.0 x 600.0
+2 |  |  |  | paintChild RenderParagraph at Point(0.0, 32.0)
+2 |  |  |  |  | TestDisplayList() constructor: 800.0 x 600.0
 ------------------------------------------------------------------------
 PAINTED 2 FRAMES