use setSet instead of setModel => makes masks items selectable

GUI/View/Setup/MasksPanel.cpp

@@ -79,7 +79,7 @@ MasksPanel::MasksPanel(const std::function<MasksSet*()>& set_source, bool mask_n
 
 void MasksPanel::updateMasksPanel()
 {
-    m_set_view->setModel(m_set_source() ? m_set_source()->model() : nullptr);
+    m_set_view->setSet(m_set_source());
     if (m_set_source())
         connect(m_set_source(), &MasksSet::setChanged, this, &MasksPanel::updateMaskEditor);
     updateMaskEditor();