Fixed the top margin and border for the first item in the keyboard shortcuts modal

[mapk]

Description

The first item in the keyboard shortcuts was still showing its border and looked funky. I've basically pushed the item up so that the border doesn't show anymore. Fixes #17588

Before:

After:

How has this been tested?

Locally on FF and Chrome.

Types of changes

CSS non-breaking changes.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[youknowriad]

LGTM 👍 but I personally wonder if this shortcut should be just included in one of the sections like "Global shortcuts"

[mapk]

personally wonder if this shortcut should be just included in one of the sections like "Global shortcuts"

That's where it used to be. There was a desire to move it out for more visibility though.