update db for expose in sqllab param (#15609)

superset/databases/api.py

@@ -246,6 +246,7 @@ class DatabaseRestApi(BaseSupersetModelRestApi):
             new_model = CreateDatabaseCommand(g.user, item).run()
             # Return censored version for sqlalchemy URI
             item["sqlalchemy_uri"] = new_model.sqlalchemy_uri
+            item["expose_in_sqllab"] = new_model.expose_in_sqllab
 
             # If parameters are available return them in the payload
             if new_model.parameters: