Clear qualifier path when changing type

This fixes a bug where overriding an enum parameter with a non-enum
parameter would result in the wrong qualifier path.

Source/Bind/Structures/Type.cs

@@ -82,6 +82,7 @@ namespace Bind.Structures
                 else
                 {
                     CurrentType = value;
+                    CurrentQualifier = String.Empty;
                 }
             }
         }