lib/copy/__tests__/copy-preserve-time: tidy up
lib/copy/__tests__/copy-preserve-time: tidy up

snuggles08/node-fs-extra,reggi/node-fs-extra,jprichardson/node-fs-extra,KoryNunn/node-fs-extra,SciSpike/node-fs-extra,JanMattner/node-fs-extra