Fix TessBed error from upgrade.

Author: speps

TessBed/TessBed.csproj

@@ -10,6 +10,7 @@
     <EnableDefaultCompileItems>false</EnableDefaultCompileItems>
     <EnableDefaultEmbeddedResourceItems>false</EnableDefaultEmbeddedResourceItems>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+    <GenerateResourceUsePreserializedResources>true</GenerateResourceUsePreserializedResources>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
     <PlatformTarget>x86</PlatformTarget>
@@ -136,6 +137,9 @@
     <EmbeddedResource Include="TestData\tank.testdat" />
     <EmbeddedResource Include="TestData\test.testdat" />
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="System.Resources.Extensions" Version="4.7.0" />
+  </ItemGroup>
   <ItemGroup>
     <Service Include="{82A7F48D-3B50-4B1E-B82E-3ADA8210C358}" />
   </ItemGroup>