CustomLinks: Pass referential directly when initialising

Instead of getting the referential to use when building the polymorphic
URL from the `UserContext`, pass in a referential directly.

The old code that used `user_context.context[:referential]` relied on
the fact that `ApplicationController#pundit_user` was defined as
follows:

     def pundit_user
       UserContext.new(current_user, referential: self.try(:current_referential))
     end

(We pass `pundit_user` into `CustomLinks` from
`TableBuilderHelper#build_links`.)

However, Robert's change 747d333ffbcc8ee0c9f1daf93ccca32799434e04
removes the `current_referential` call from `#pundit_user`. In
`CustomLinks`, we actually always want to be using
`current_referential`.

For example, on `Companies#index` (/line_referentials/:id/companies),
`CustomLinks` fails to build a correct #show link because
`user_context.context[:referential]` is `nil`, when it should instead be
a `LineReferential` object, that gets returned by the
`#current_referential` helper method. Sure, `#current_referential` is
hard to understand, so maybe we'll change that around in the future, but
this at least allows us to use the current referential in `CustomLinks`.

Refs #3479

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