Fix API group/issues default state filter

What does this MR do?

Fix API result for api/v3/groups/:id/issues (without state filter). According to documentation https://docs.gitlab.com/ce/api/issues.html#list-group-issues

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)

What are the relevant issue numbers?

Closes #23655 (closed)