Change to use sessionStorage instead of localStorage, for tracking tour Id.
Change to use sessionStorage instead of localStorage, for tracking tour Id.

https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage

There is no expiration for the Storage apis, unless roll our own with
json encoded dates. Using sessionstorage seems like a good quick
improvement though.

https://legume.atlassian.net/browse/LEGUME-625

ncgr/lis_hopscotch_tours,legumeinfo/lis_tours