Remove an extra padding in y-axis on Epic detail

What does this MR do?

Removes an extra padding in y-axis on Epic detail Web page.

Ordering class name is just aligned with non-Vue component of Issue detail: https://gitlab.com/gitlab-org/gitlab/-/blob/2b93a3e58e18d3f484b231251f7116ae59b6d5ee/app/views/projects/issues/show.html.haml#L61-62 .

cf. !8059 (merged)

Screenshots

before	after
#232084[epic-title-before.png]	#232084[epic-title-after.png]

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [n/a] Documentation (if required)
• Code review guidelines
• [n/a] Merge request performance guidelines
• Style guides
• [n/a] Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

• [n/a] Label as security and @ mention @gitlab-com/gl-security/appsec
• [n/a] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [n/a] Security reports checked/validated by a reviewer from the AppSec team

Closes #232084 (closed)