[Bug]: Update import tokens banner padding

[amandaye0h]

Describe the bug

Padding on the bottom looks odd, which throws off the vertical rhythm.

Expected behavior

Top right bottom and left padding is updated to 16px, 16px, 4px and 16px

Screenshots/Recordings

Figma link

Steps to reproduce

1. Must be a new user with not all tokens added
2. Open MetaMask
3. Click on Activity tab

Error messages or log output

No response

Detection stage

In production (default)

Version

11.16.16

Build type

None

Browser

Brave

Operating system

MacOS

Hardware wallet

No response

Additional context

Ping @amandaye0h for context

Severity

No response