rm 'Edit structure' button (#758)

This resolves #758 (closed).

GUI/View/SampleDesigner/LayerForm.cpp

@@ -68,8 +68,6 @@ LayerForm::LayerForm(QWidget* parent, LayerItem* layerItem, SampleEditorControll
     {
         m_moveButton = new WidgetMoverButton(this, this, 1);
         m_moveButton->setToolTip("Move layer up/down");
-        connect(m_moveButton, &WidgetMoverButton::startingToMove, ec,
-                &SampleEditorController::onStartingToMoveLayer);
         connect(m_moveButton, &WidgetMoverButton::finishedMoving, ec,
                 &SampleEditorController::onStoppedToMoveLayer);
         m_collapser->addWidget(m_moveButton);