Minor tweaks

Author: bastianeicher

src/CodeGeneration/CSharpConstructor.cs

@@ -58,7 +58,7 @@ internal ObjectCreationExpressionSyntax ToInvocationSyntax()
         /// </summary>
         internal ConstructorDeclarationSyntax ToDeclarationSyntax(string typeName)
             => ConstructorDeclaration(Identifier(typeName))
-              .WithModifiers(TokenList(Token(SyntaxKind.PublicKeyword)))
+              .AddModifiers(Token(SyntaxKind.PublicKeyword))
               .WithParameterList(GetParameterList())
               .WithInitializer(ConstructorInitializer(SyntaxKind.BaseConstructorInitializer, GetArgumentList(thisKeyword: false)))
               .WithBody(Block());

src/CodeGeneration/CSharpType.cs

@@ -5,7 +5,6 @@
 using System.Collections.Generic;
 using System.Linq;
 using Microsoft.CodeAnalysis;
-using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
 using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;