Fix people filter by group

[yurabakhtin]

What kind of change does this PR introduce? (check at least one)

• Bugfix

The PR fulfills these requirements:

• It's submitted to the develop branch, not the master branch if no hotfix
• All tests are passing
• Changelog was modified

Other information:
#6962 (comment)

[ArchBlood]

@yurabakhtin first thanks for the quick action, although I now see a different issue when it comes to the group filter, not sure if this was intended or not;

[yurabakhtin]

first thanks for the quick action, although I now see a different issue when it comes to the group filter, not sure if this was intended or not;

@ArchBlood I think it is not an issue, it is a feature which was implemented here, it works like this: if some filter is active then values of all filters are reduced to what the filtered users have. For your case, the group "Team" is became hidden because the filtered users are not in the Team group, and such behaviour works for other filter as well.