[Tagging] sport=horse_racing unnecessary sport=equestrian

[Andreas Goss]

> "horse racing" is a very different animal (pun intended) to e.g 3 day
> eventing, country point-to-points, gymkhanas, etc.

But do you plan to tag those with sport=horse_3_day_eventing, 
sport=horse_country_point-to-points and sport=hose_gymkhana?

Because I have the impression they are all still sport=equestrian just 
like racing.
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