Summary:
on databases section, queries marked as "favorite", are not persisted. With this changes, they will be saved at localStorage and persist from refresh.
Improves on parse json values from databases.
## Changelog
Pull Request resolved: https://github.com/facebook/flipper/pull/738
Reviewed By: mweststrate
Differential Revision: D19330218
Pulled By: passy
fbshipit-source-id: 673b2d0bbee9b3ef4544defaca0e3c5547a992a2
b0caaa7254