[6.x] Border in asset fieldtype in grid view

[helloDanuk]

Bug description

• Thicker bottom border when show_filenames turned off.
• 'transparent' rounded corners

How to reproduce

Asset fieldtype with grid view and show_filename turned off.

Logs

Environment

6.0.0-beta.2

Installation

Fresh statamic/statamic site via CLI

Additional details

No response

[JayGeorge]

Fixed by #13584