When upload multiple files, always files with error are removed

[alphp]

When uploading multiple files, files with errors are always removed even with removeFromPreviewOnError = false

DEMO: https://fileinput.rf.gd/ https://github.com/alphp/bootstrap-fileinput-ajax-test

Steps to reproduce the issue

1. Upload one JPG
2. Repeat step 1: Throw error when try to upload files duplicates
3. Reload page
4. Try to upload new jpg and the first (step 1): The new file uploads without error. The duplicate file throws an error and is removed from the list despite having removeFromPreviewOnError: false.