File renaming not executed correctly

[hman2]

Version 2.0 running on Nougat.

Steps to reproduce:

1. Create and share a Note with MyOwnCloud.
2. Rename the text file on the PC
3. On the app, a duplicate of the note appears.

This is obviously because MyOwnNotes only executes the first half of renaming: Copying to a new file name (where the same first line is contained, thus creating a duplicate entry). The second would be the deletion of the old file, which for reasons unknown is not carried out.