fix surface test

Author: kMutagene

tests/Plotly.NET.Tests/HtmlCodegen/Charts3D.fs

@@ -182,7 +182,7 @@ let ``Surface charts`` =
             emptyLayout firstSurfaceChart
         );
         testCase "Second surface data" ( fun () ->
-            """var data = [{"type":"surface","x":[0.0,2.5],"y":[0.0,2.5],"z":[[1.0,1.0],[1.0,2.0]],"contours":{"x":{"show":true},"y":{"show":true},"z":{"show":true}},"opacity":0.5}];"""
+            """var data = [{"type":"surface","opacity":0.5,"x":[0.0,2.5],"y":[0.0,2.5],"z":[[1.0,1.0],[1.0,2.0]],"contours":{"x":{"show":true},"y":{"show":true},"z":{"show":true}}}];"""
             |> chartGeneratedContains secondSurfaceChart
         );
         testCase "Second surface layout" ( fun () ->