Simplify Order#to_param
Simplify Order#to_param

The existing to_param called .to_s.to_url.upcase, however when order is
found by an incoming param find_by_number is always used. Therefore
to_param must always match number exactly. For the default number
generation this was always already the case.

This makes Order#to_param significantly faster.

Calculating -------------------------------------
        order.number    42.199k i/100ms
order.number.to_s.to_url.upcase
                       176.000  i/100ms
-------------------------------------------------
        order.number      2.155M (± 0.7%) i/s -     10.803M
order.number.to_s.to_url.upcase
                          1.851k (±14.3%) i/s -      9.152k

jordan-brough/solidus,pervino/solidus,jordan-brough/solidus,Arpsara/solidus,pervino/solidus,pervino/solidus,pervino/solidus,jordan-brough/solidus,Arpsara/solidus,Arpsara/solidus,Arpsara/solidus,jordan-brough/solidus