[libcalamaresui] Remove the special * operator for string-enums in branding

- This is a good example of being overly clever in C++
- the whole API with an enum requesting a specific string is a bit weird,
  although it makes sense from the 'might need more strings specified'
  point of view.

src/libcalamaresui/Branding.h

@@ -209,6 +209,11 @@ public:
 
 public slots:
     QString string( StringEntry stringEntry ) const;
+    QString versionedName() const { return string( VersionedName ); }
+    QString productName() const { return string( ProductName ); }
+    QString shortProductName() const { return string( ShortProductName ); }
+    QString shortVersionedName() const { return string( ShortVersionedName ); }
+
     QString styleString( StyleEntry styleEntry ) const;
     QString imagePath( ImageEntry imageEntry ) const;
 
@@ -249,13 +254,6 @@ private:
     PanelSide m_navigationSide = PanelSide::Bottom;
 };
 
-template < typename U >
-inline QString
-operator*( U e )
-{
-    return Branding::instance()->string( e );
-}
-
 }  // namespace Calamares
 
 #endif  // BRANDING_H