Avoid parentheses around lambdas where possible.

Author: dgrunwald

ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj

@@ -91,6 +91,7 @@
     <Compile Include="..\ILSpy\DebugInfo\DebugInfoUtils.cs" Link="DebugInfoUtils.cs" />
     <Compile Include="..\ILSpy\DebugInfo\PortableDebugInfoProvider.cs" Link="PortableDebugInfoProvider.cs" />
     <Compile Include="DisassemblerPrettyTestRunner.cs" />
+    <Compile Include="Output\InsertParenthesesVisitorTests.cs" />
     <Compile Include="ProjectDecompiler\TargetFrameworkTests.cs" />
     <Compile Include="TestAssemblyResolver.cs" />
     <Compile Include="TestCases\Correctness\DeconstructionTests.cs" />