Fix persisting datasource selection choice (#6181)

* Fix persisting datasource selection choice

Closes #5646.

We were already storing this in localStorage, however we weren't
accounting for the fact that it was stored as a string, rather than
an integer.

* Restyled by prettier (#6182)

Co-authored-by: Restyled.io <commits@restyled.io>

---------

Co-authored-by: restyled-io[bot] <32688539+restyled-io[bot]@users.noreply.github.com>
Co-authored-by: Restyled.io <commits@restyled.io>

client/app/pages/queries/QuerySource.jsx

@@ -134,11 +134,10 @@ function QuerySource(props) {
     // choose data source id for new queries
     if (dataSourcesLoaded && queryFlags.isNew) {
       const firstDataSourceId = dataSources.length > 0 ? dataSources[0].id : null;
+      const selectedDataSourceId = parseInt(localStorage.getItem("lastSelectedDataSourceId")) || null;
+
       handleDataSourceChange(
-        chooseDataSourceId(
-          [query.data_source_id, localStorage.getItem("lastSelectedDataSourceId"), firstDataSourceId],
-          dataSources
-        )
+        chooseDataSourceId([query.data_source_id, selectedDataSourceId, firstDataSourceId], dataSources)
       );
     }
   }, [query.data_source_id, queryFlags.isNew, dataSourcesLoaded, dataSources, handleDataSourceChange]);