Playground: Give Admin user example the administrator role

[stirby]

The playground "Administrator" user does not have the built-in administrator role. This makes examples awkward because an example that works for the playground will not apply to a template in the control plane, and vice-versa.

Let's give that example user the same role as it appears in coder/coder.

[stirby]

Discovered via:
https://playground.coder.app/parameters/example/basic-governance

[brettkolodny]

Which role(s) should be added to the user? owner, user-admin, organization-admin, etc.

[stirby]

I think owner, organization-admin.