Fix export map as image/PDF does not respect labeling engine settings

Author: nirvn

src/app/qgsmapsavedialog.cpp

@@ -295,6 +295,7 @@ void QgsMapSaveDialog::applyMapSettings( QgsMapSettings &mapSettings )
   mapSettings.setBackgroundColor( mMapCanvas->canvasColor() );
   mapSettings.setRotation( mMapCanvas->rotation() );
   mapSettings.setLayers( mMapCanvas->layers() );
+  mapSettings.setLabelingEngineSettings( mMapCanvas->mapSettings().labelingEngineSettings() );
   mapSettings.setTransformContext( QgsProject::instance()->transformContext() );
   mapSettings.setPathResolver( QgsProject::instance()->pathResolver() );