Remove special case in :passing_through_uk_border_control?
Remove special case in :passing_through_uk_border_control?

In preparation for splitting the outcome_transit_taiwan template into
two: one for passing through border control and one for not.

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