Change the statistics link to default to flat view instead of fandom view

[gingerchew]

Essentially I am most interested in seeing how all my works are doing and less about how they are doing in context. Ideally, this is a setting on AO3's side, but oh well.

You could also set it to default to other views as the default, say kudos instead of hits, but that's an after thought.

I have some experience coding extensions, so I'd be more than happy to make a draft PR if that is easier for you 😊