Avoid calling `each_value` on params in contacts controller
Avoid calling `each_value` on params in contacts controller

We can use `each_pair` and ignore the key to achieve the same thing and
no longer rely on a method on params that may not exist in rails 5.1 when
params stop being a hash.

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall