Cleanup of long-winded method
Cleanup of long-winded method

This should have been done in the earlier commit/PR when it was created, but it got missed.

There's no need for the apply dance, we can just call `lastDefined` with an array, and `pluck` is way more consise.

tijmenb/spotlight,keithiopia/spotlight,keithiopia/spotlight,tijmenb/spotlight,alphagov/spotlight,tijmenb/spotlight,keithiopia/spotlight,alphagov/spotlight,alphagov/spotlight