add visConfig.title to pipeline visualization function

- To be consistent with visualizations built with "buildPipelineVisFunction".
- To provide "title" information for visualizations.

src/plugins/visualizations/public/legacy/build_pipeline.ts

@@ -301,6 +301,7 @@ export const buildPipeline = async (vis: Vis, params: BuildPipelineParams) => {
     } else {
       const visConfig = { ...vis.params };
       visConfig.dimensions = schemas;
+      visConfig.title = title;
       pipeline += `visualization type='${vis.type.name}'
     ${prepareJson('visConfig', visConfig)}
     metricsAtAllLevels=${vis.isHierarchical()}