file conflict dialog does not allign file list correctly in FF

[individual-it]

Steps to reproduce

1. in FF upload multiple files where more than 3 will cause a conflict

Expected behaviour

Actual behaviour

Server configuration

Operating system:
Ubuntu 18.04
Web server:
Apache2
Database:
SQLite
PHP version:
7.2
ownCloud version: (see ownCloud admin page)
git-master, 10.2.0, 10.1.1, 10.0

Client configuration

Browser:
FF, works fine on Chrome
Operating system:
Ubuntu 18.04