Make detailed results public when competition is public

[Didayolo]

Description

Make detailed results public to everybody when the competition is public, as a completion of #1982 feature.
When the competition is private, only participants, organizers or superusers should be able to access the detailed results.

Issues this PR resolves

• Closes Deatailed results invisible #2085

A checklist for hand testing

Public competition

• Try to access the detailed results while logged in --> should work
• Try to access the detailed results while NOT logged in --> should work

Private competition

• Try to access the detailed results while participating in --> should work
• Try to access the detailed results while NOT participating in --> should NOT work
• Try to access the detailed results while NOT logged in --> should NOT work

Checklist

• Code review by me
• Hand tested by me
• I'm proud of my work
• Code review by reviewer
• Hand tested by reviewer
• CircleCi tests are passing
• Ready to merge