Remove carrierwave underscore filename helper

[dan-palmer]

Carrierwave replaces spaces with underscores by default when persisting the uploaded object details to the DB. Remove the unnecessary filename processing form the app.

app/forms/additional_claimants_upload_form.rb: 

app/forms/claim_details_form.rb:

app/mailers/base_mailer.rb:

app/presenters/claim_details_presenter.rb:

app/presenters/claimant_csv_presenter.rb:

app/presenters/confirmation_presenter.rb:

app/presenters/jadu_xml/file_presenter.rb:

app/services/jadu/claim.rb: