FileCopyJob: fix regression when copying a data: URL
This came from commit 54ca9f06, not released yet. Detected by purpose's alternativesmodeltest:bigBufferTest. Yay for the release checklist saying "check CI" :)
This came from commit 54ca9f06, not released yet. Detected by purpose's alternativesmodeltest:bigBufferTest. Yay for the release checklist saying "check CI" :)