Deleted '-' milestone on bugzilla

["Zeeshan Ali (Khattak)" <zeeshanak gnome org>]

Hi everyone,

I was editting milestones of gnome-boxes product on bugzilla and I
decided to delete the '-' milestone (which AFAIK means unknown) and
seems I ended up deleting it for all products. :(

I'm terribly sorry for this but I think it's more the bugzilla
interface that's to blame here since the it gives me the impression
that I'm only editing one product.

Anyway, I apologize for this inconvenience.

-- 
Regards,

Zeeshan Ali (Khattak)