[Sprint/InterestingIguana](feat): Preferred hashtag remembered in local storage #1366

Closes #1302 (closed)

Test that your selection for preferred is remembered in local storage.

1. Set it to on
2. Tab over to wallet or another page
3. Refresh
4. Visit discovery - it should have remembered the state was on.
5. Turn it off, and repeat to confirm that is remembers the 'off' state