Remove unused and duplicated private function

Author: elpaso

src/core/layout/qgslayoutitemlegend.cpp

@@ -447,11 +447,6 @@ void QgsLayoutItemLegend::setRasterStrokeWidth( double width )
   mSettings.setRasterStrokeWidth( width );
 }
 
-void QgsLayoutItemLegend::synchronizeWithModel()
-{
-  adjustBoxSize();
-  updateFilterByMap( false );
-}
 
 void QgsLayoutItemLegend::updateLegend()
 {

src/core/layout/qgslayoutitemlegend.h

@@ -448,9 +448,6 @@ class CORE_EXPORT QgsLayoutItemLegend : public QgsLayoutItem
 
   private slots:
 
-    //! Data changed
-    void synchronizeWithModel();
-
     //! Removes the associated map if the map is deleted.
     void invalidateCurrentMap();