Ensure layer style dock is updated when toggling legend items through

layer tree menu

Fixes #40630

(cherry picked from commit 457d661)

src/core/layertree/qgslayertreemodellegendnode.cpp

@@ -416,6 +416,7 @@ void QgsSymbolLegendNode::toggleAllItems()
   }
 
   emit dataChanged();
+  vlayer->emitStyleChanged();
   vlayer->triggerRepaint();
 }
 
@@ -453,6 +454,7 @@ void QgsSymbolLegendNode::checkAll( bool state )
   }
 
   emit dataChanged();
+  vlayer->emitStyleChanged();
   vlayer->triggerRepaint();
 }