Q_DECLARE_METATYPE isn't needed for Qt6 QExplicitlySharedDataPointer

src/profile/Profile.h:815:1: error: specialization of ‘QMetaTypeId<QExplicitlySharedDataPointer<Konsole::Profile> >’ after instantiation
  815 | Q_DECLARE_METATYPE(Konsole::Profile::Ptr)
      | ^~~~~~~~~~~~~~~~~~
src/profile/Profile.h:815:1: error: redefinition of ‘struct QMetaTypeId<QExplicitlySharedDataPointer<Konsole::Profile> >’
/usr/include/qt6/QtCore/qmetatype.h:1124:8: note: previous definition of ‘struct QMetaTypeId<QExplicitlySharedDataPointer<Konsole::Profile> >’
 1124 | struct QMetaTypeId : public QMetaTypeIdQObject<T>