Failed to execute operation as admin

[bsngardner]

Describe
Changing file/folder ownership from root to another user in admin mode results in the error
E: Failed to execute operation as admin

To Reproduce

1. Make some files owned by root
2. Start Polo as root or open new admin window
3. Select files owned by root, right click, go to properties
4. Set "Owner" to another user
5. Error occurs

Expected behavior
The file ownership should change.

System:

• Arch Linux
• KDE 5.16.3-1
• Polo File Manager v18.8.3 BETA

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