Instance Admins as moderators are not shown

[BentiGorlich]

Describe the bug If the admin of the local instance is a moderator of a remote magazine, they are not shown as moderator nor do they count as one

On which Mbin instance did you find the bug? [gehirneimer.de, kbin.run, kbin.melroy.org]

To Reproduce Steps to reproduce the behavior:

1. Create a magazine with account A on instance X
2. Go to instance Y where you are the instance admin
3. Pull that magazine in
4. On instance X make your account from instance Y moderator of the created magazine
5. On instance Y only the initial moderator is shown

Expected behavior All moderators are shown and counted

Additional context The local admin has an entry in the moderators table for every remote magazine with the column "is_owner" set to true. In the twig component the "owner" of a remote magazine always gets hidden because the "owner" isn't usually actually a moderator. We probably need to add another column "is_owner_moderator" or something that is only every true if "is_owner" is true and the owner is actually a moderator of the magazine