bugfix for quick boluses not getting visualized

Fix for the fact (reported via support) that quick boluses weren't being visualized. The [hotfix](https://github.com/tidepool-org/tideline/tree/jebeck/hotfix-quick-bolus) is on a branch from tag v0.0.59 and should not be merged into master. (It has already been tagged v0.0.59-hotfix, and I'm creating a blip hotfix from blip tag v0.2.14.)

The issue, briefly, is that tideline was assuming that all boluses that have a `joinKey` have one because they *can* be connected with a wizard event, but this is not actually the case in the output of current in-d-gestion (here we delete them when they don't connect with a wizard event because we really don't have any other way of separating bolus events that are and aren't associated with wizards). I don't know if that's because this changed at some point, or if it's just been a longstanding (old) data model mismatch...

Someone review: @ianjorgensen @nicolashery or @jh-bate?