[BUG] Invalid value of `border-top-left-radius` in `adminlte.css`

[KunalTanwar]

Describe the bug In adminlte.css you can find .card > .list-group:first-child and .card-img, .card-img-top with border-top-left-radius: calc(0.25rem - 0); which is invalid.

To Reproduce Steps to reproduce the behavior:

1. Go to 'https://github.com/ColorlibHQ/AdminLTE/blob/master/dist/css/adminlte.css'
2. Search for border-top-left-radius: calc(0.25rem - 0)
3. See invalid css

Expected behavior It should 0.25rem not calc(0.25rem - 0)

Environment (please complete the following information):

• AdminLTE Version: v3.0.0
• Operating System: Windows 11
• Browser (Version): Chrome (Latest)