Revert "TEMP: Use next_node instead of next_node_if"
Revert "TEMP: Use next_node instead of next_node_if"

This will allow me to use the code coverage tool to ensure we're covering the
whole flow with the responses we generate.

tadast/smart-answers,alphagov/smart-answers,alphagov/smart-answers,askl56/smart-answers,aledelcueto/smart-answers,askl56/smart-answers,stwalsh/smart-answers,aledelcueto/smart-answers,stwalsh/smart-answers,tadast/smart-answers,stwalsh/smart-answers,alphagov/smart-answers,tadast/smart-answers,askl56/smart-answers,stwalsh/smart-answers,tadast/smart-answers,alphagov/smart-answers,aledelcueto/smart-answers,aledelcueto/smart-answers,askl56/smart-answers