Fix bookmarks local storage shape
Fix bookmarks local storage shape

- played with old ext again and realised the shape is not an array of URLs but an array of objects with `url` and `lastVisitTime`... could have sworn with the extension I had installed before it was an array of URLs...
- anyway slightly change the init code to attemp to parse that into the array of URLs

WorldBrain/WebMemex,WorldBrain/WebMemex