fix histogram2d/contour tests

Author: kMutagene

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

@@ -226,14 +226,14 @@ let histogram2DChart =
 let ``Histogram 2D charts`` =
     testList "DistributionCharts.Histogram charts" [
         testCase "Histo contour data" ( fun () ->
-            "var data = [{\"type\":\"histogram2Dcontour\",\"x\":[-1.566002360265054,-1.833996340961623,-1.0330391275776571,-0.8476993487909306,-0.8471270832604864,-1.021055309868153,-0.5368298779218124,-0.9982579324563884,-0.6367576994858231,-1.433590036163408,-1.3735531103452598"
+            "var data = [{\"type\":\"histogram2dcontour\",\"x\":[-1.566002360265054,-1.833996340961623,-1.0330391275776571,-0.8476993487909306,-0.8471270832604864,-1.021055309868153,-0.5368298779218124,-0.9982579324563884,-0.6367576994858231,-1.433590036163408,-1.3735531103452598"
             |> chartGeneratedContains histogramContourChart
         );
         testCase "Histo contour layout" ( fun () ->
             emptyLayout histogramContourChart
         );
         testCase "Histo 2D data" ( fun () ->
-            "var data = [{\"type\":\"histogram2D\",\"x\":[-1.566002360265054,-1.833996340961623,-1.0330391275776571,-0.8476993487909306,-0.8471270832604864,-1.021055309868153,-0.5368298779218124,-0.9982579324563884,-0.6367576994858231,-1.433590036163408,-1.3735531103452598"
+            "var data = [{\"type\":\"histogram2d\",\"x\":[-1.566002360265054,-1.833996340961623,-1.0330391275776571,-0.8476993487909306,-0.8471270832604864,-1.021055309868153,-0.5368298779218124,-0.9982579324563884,-0.6367576994858231,-1.433590036163408,-1.3735531103452598"
             |> chartGeneratedContains histogram2DChart
         );
         testCase "Histo 2D layout" ( fun () ->