cmd: structure: clean up redundant ifrit stuff
cmd: structure: clean up redundant ifrit stuff

concourse/concourse#5421

This was accidentally left in frmo when @vito and I were experimenting with ways
to invoke the `concourse` binary in tests.

Signed-off-by: Jamie Klassen <d740210502544aa0776b92978c6db85774130b86@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse