Custom Wizards: No files generated.

Fix breakage introduced by 65e95c3aba,
introducing a writeAccess attribute not properly initialized
in the default CT. The GeneratedFile::CustomGeneratorAttribute
exists for that purpose.

Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>
Task-number: QTCREATORBUG-2518

src/plugins/coreplugin/basefilewizard.h

@@ -101,7 +101,6 @@ public:
     void setEditorId(const QString &k);
 
     bool write(QString *errorMessage) const;
-    void setWriteAccess(bool access = true);
 
     Attributes attributes() const;
     void setAttributes(Attributes a);