Prune -id -collect-only overwrites Fossil collection 1

[gorlen]

Please describe what you are doing to trigger the bug:

duplicacy prune -id a -keep 0:1800 -keep 7:30 -keep 1:7 -collect-only
duplicacy prune -id b -keep 0:1800 -keep 7:30 -keep 1:7 -collect-only
duplicacy prune -id c -keep 30:365 -keep 7:90 -keep 1:7

Please describe what you expect to happen (but doesn’t):
Expect prune to run without creating unreferenced fossils.

Please describe what actually happens (the wrong behaviour):
First prune command saves Fossil collection 1; second prune command overwrites Fossil collection 1, creating unreferenced fossils.

[gchen]

I can confirm that this is a bug. I’ll fix it in the next CLI release.

Thank you for the find!