Fix display of selected filters in the column headers

Steps to reproduce (on https://nightly-2021.nuxeocloud.com/nuxeo for example) :

1. navigate to a workspace
2. add the columns "State", "Version", "Author" and "Created" to narrow the width of each column displayed in the table
3. go to the "Modified" header and select all the possible values : Last 24h, Last week, Last month, Last year, More than a year ago
4. observe that only the last one is visible and it's not possible to scroll to see the other selected values

Expected behavior: it should be possible to scroll in the column header to see all the selected filters

Note that this behavior was correct in LTS 2019