Fix permission to access passage detail for an observer team

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

participation/views.py

@@ -1931,7 +1931,7 @@ class PassageDetailView(LoginRequiredMixin, DetailView):
                      or reg in passage.pool.juries.all()
                      or reg.pools_presided.filter(tournament=passage.pool.tournament).exists()) \
                 or reg.participates and reg.team \
-                and reg.team.participation in [passage.defender, passage.opponent, passage.reviewer]:
+                and reg.team.participation in [passage.defender, passage.opponent, passage.reviewer, passage.observer]:
             return super().dispatch(request, *args, **kwargs)
         return self.handle_no_permission()