Ref T225, force stylesheet in CForm base class and used by all forms

* Allows to use stylesheet attributes like [readonly]
* changing to "readonly" applies correct stylesheet

src/blackgui/editors/distributorform.h

@@ -23,7 +23,6 @@
 
 class QWidget;
 namespace Ui { class CDistributorForm; }
-
 namespace BlackGui
 {
     namespace Editors