Fix#21324
In the current logic, if the `Actor` user is not an admin user, all
activities from private organizations won't be shown even if the `Actor`
user is a member of the organization.
As mentioned in the issue, when using deploy key to make a commit and
push, the activity's `act_user_id` will be the id of the organization so
the activity won't be shown to non-admin users because the visibility of
the organization is private.
55a5717760/models/activities/action.go (L490-L503)
This PR improves this logic so the activities of private organizations
can be shown.
29637b03b2