Remove exception notification initializer
Remove exception notification initializer

There's no need for this if the initializers are provided at deploy-time. Once
alphagov/alphagov-deployment#58 gets merged, that will be true.

bitzesty/trade-tariff-frontend,bitzesty/trade-tariff-frontend,alphagov/trade-tariff-frontend,alphagov/trade-tariff-frontend,alphagov/trade-tariff-frontend,bitzesty/trade-tariff-frontend,alphagov/trade-tariff-frontend,bitzesty/trade-tariff-frontend