Remove inner padding from epics list SVG

Purpose

Remove inner padding from epics list SVG. This is required to replace the illustration we have in the GitLab codebase with the illustration from GitLab SVG. See the discussion here for more information and context.

Screenshots

Before vs after.

Before	After

Checklist

For a new icon and/or illustration:

• Link to related design issue:
• If this adds an icon ensure that it follows the new icon checklists.
• If this adds an illustration ensure that it follows the new illustration checklists.

For third-party trademarks:

• If this adds or updates an icon or illustration that includes a third-party trademark, ensure that it follows the process for adding third-party trademarks to GitLab.