Fixed a bug when having a default arg in a ctor of a derived type.

Signed-off-by: Dimitar Dobrev <dpldobrev@yahoo.com>

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -2030,7 +2030,8 @@ namespace CppSharp.Generators.CSharp
             }
             NewLine();
 
-            if (method.Kind == CXXMethodKind.Constructor)
+            if (method.Kind == CXXMethodKind.Constructor &&
+                method.SynthKind != FunctionSynthKind.DefaultValueOverload)
                 GenerateClassConstructorBase(@class, method);
 
             WriteStartBraceIndent();

tests/CSharpTemp/CSharpTemp.h

@@ -256,7 +256,7 @@ class QList
 {
 };
 
-class DLL_API MethodsWithDefaultValues
+class DLL_API MethodsWithDefaultValues : public Quux
 {
 public:
     MethodsWithDefaultValues(Foo foo = Foo());