update create_test_app to not bypass config checking

[renderorange]

the create_test_app method in Pasteburn::Test bypasses the config checking, so any frontend integration tests don't validate if configuration options aren't set (but running through the normal dancer2 app does).

update the create_test_app method to not bypass config checking, so all integration tests will fail if configuration options aren't set correctly. this more closely tests running on production.

[renderorange]

updated in commit 88318fc