Update src/Microsoft.CodeAnalysis.Testing/Microsoft.CodeAnalysis.Testing.Verifiers.NUnit/Microsoft.CodeAnalysis.Testing.Verifiers.NUnit.csproj

Co-authored-by: Sam Harwell <sam@tunnelvisionlabs.com>

src/Microsoft.CodeAnalysis.Testing/Microsoft.CodeAnalysis.Testing.Verifiers.NUnit/Microsoft.CodeAnalysis.Testing.Verifiers.NUnit.csproj

@@ -15,10 +15,7 @@
 
   <ItemGroup>
     <PackageReference Include="NUnit" Version="3.0.0" />
-    <PackageReference Include="NUnit.Analyzers" Version="3.9.0">
+    <PackageReference Include="NUnit.Analyzers" Version="3.9.0" PrivateAssets="all" />
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
-    </PackageReference>
   </ItemGroup>
 
   <ItemGroup>