fix sidebar padding for full-width items (Time Tracking help)

What does this MR do?

fix padding on issue right sidebar. previously was cutting off the Help section for time tracking. Now the padding is applied to the inner element, so it only hides stuff that overflows the entire sidebar

Are there points in the code the reviewer needs to double check?

does this affect anything other than issues, boards & build sidebar

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [ ] Documentation created/updated
• [ ] API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #34578 (closed)