Fix base constructor calls.

ICSharpCode.Decompiler/CSharp/CallBuilder.cs

@@ -209,10 +209,12 @@ namespace ICSharpCode.Decompiler.CSharp
 					} else {
 						if (method.IsStatic)
 							requireTarget = !expressionBuilder.IsCurrentOrContainingType(method.DeclaringTypeDefinition) || method.Name == ".cctor";
+						else if (method.Name == ".ctor")
+							requireTarget = true; // always use target for base/this-ctor-call, the constructor initializer pattern depends on this
 						else if (target.Expression is BaseReferenceExpression)
 							requireTarget = (callOpCode != OpCode.CallVirt && method.IsVirtual);
 						else
-							requireTarget = !(target.Expression is ThisReferenceExpression) || method.Name == ".ctor";
+							requireTarget = !(target.Expression is ThisReferenceExpression);
 					}
 					bool targetCasted = false;
 					bool argumentsCasted = false;