Autoupload of custom folders skips folders

### Actual behaviour
setting up a custom autoupload rule for a folder should copy all content in the folder, actualy only files are autouploaded, folder structure that reside in the autoupload folder is skipped.

### Expected behaviour
setting up a custom autoupload rule for a folder should copy all content in the folder, including folders.

### Steps to reproduce
1. add autoupload of a custom folder
2. find an app that saves files in day, months and year folderstructure inside autoupload folder
3. wait until app upload starts uploading new content from the folder.
4. Only files are uploaded, folders that are created in the autoupload folder are skipped.

### Environment data
Android version:
4.4.4
Device model:
samsung-s3
Stock or customized system:
stock
Nextcloud app version:
2.0.0.RC5
Nextcloud server version:
12.0.2
### Logs
#### Web server error log
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Insert your webserver log here
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#### Nextcloud log (data/nextcloud.log)
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Insert your Nextcloud log here
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