Private organization now shown in /admin/orgs page

[nicorac]

• Gitea version (or commit ref): 64ce159
• Git version: 2.7.4
• Operating system: Ubuntu Server 18.04.2
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  Created private organization bca for user nicorac, but can't open /admin/orgs page because of missing administrative privileges...

Description

Just upgraded to 64ce159 and marked an organization as private (thanks to @DblK and @lafriks for that feature).

Now the private organization is not shown in Admin page at /admin/orgs.
I think that administrators should be able to see all of the organizations...

Additional info: being a member of that organization, I can see it in /explore/organizations but can't see it in /admin/orgs.