Remove no longer needed `!important` on `overflow: visible` because the
new list view doesn't have any stacking context issue. Thanks to the
`o_PopoverManager` inside the `o-main-components-container`.
Steps to reproduce:
> Open the helpdesk app
> Click on VIP Support tickets
> Go to the list view
> reduce the size of the activities column
=> it's produce text contain overlapping with the other column => bug
X-original-commit: e22abffdc230c2ae494a85fdf7fd8d6b488be3ea
Part-of: odoo/odoo#102608