Avoid removing files unrelated to backup being deleted.
Avoid removing files unrelated to backup being deleted.

This fixes issues #3845 and #4244.

mnaiman/duplicati,duplicati/duplicati,duplicati/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,duplicati/duplicati,mnaiman/duplicati,mnaiman/duplicati