Fix email-subscription-already-subscribed
flash inconsistency
#2325
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In email-alert-frontend we set this flash message in the
AccountSubscriptionsController[1][2], but the name of the key used in
this app was inconsistent with what was being set - so the banner was
never being shown.
[1] https://github.com/alphagov/email-alert-frontend/blob/22a0a2048dc09243a386a214bb507c52f51bc8f1/app/controllers/account_subscriptions_controller.rb#L86
[2] https://github.com/alphagov/email-alert-frontend/blob/22a0a2048dc09243a386a214bb507c52f51bc8f1/app/services/create_account_subscription_service.rb#L5
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