VcsBase: Remove Q_PROPERTY definitions

The initial intention was to make these widgets usable from Designer.

We don't expect a lot of new uses in this direction, and clazy
seems to warn about not-so-complete Q_PROPERTY definitions:

Link https://github.com/KDE/clazy/blob/master/docs/checks/README-qproperty-without-notify.md

Change-Id: I4a2e9ff6ec7ecfd989196801c789533b4c44e8af
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/vcsbase/submitfieldwidget.h

@@ -18,9 +18,6 @@ struct SubmitFieldWidgetPrivate;
 class VCSBASE_EXPORT SubmitFieldWidget : public QWidget
 {
     Q_OBJECT
-    Q_PROPERTY(QStringList fields READ fields WRITE setFields DESIGNABLE true)
-    Q_PROPERTY(bool hasBrowseButton READ hasBrowseButton WRITE setHasBrowseButton DESIGNABLE true)
-    Q_PROPERTY(bool allowDuplicateFields READ allowDuplicateFields WRITE setAllowDuplicateFields DESIGNABLE true)
 
 public:
     explicit SubmitFieldWidget(QWidget *parent = nullptr);