Add missing scope
Add missing scope

Fixes

```
rspec ./spec/unit/authorization/index_overriding_spec.rb[1:1]
```

vraravam/activeadmin,cmunozgar/activeadmin,mauriciopasquier/active_admin,activeadmin/activeadmin,siutin/activeadmin,maysam/activeadmin,vytenis-s/activeadmin,maysam/activeadmin,mauriciopasquier/active_admin,mrjman/activeadmin,SoftSwiss/active_admin,wspurgin/activeadmin,javierjulio/activeadmin,activeadmin/activeadmin,vytenis-s/activeadmin,mrjman/activeadmin,varyonic/activeadmin,siutin/activeadmin,varyonic/activeadmin,mrjman/activeadmin,deivid-rodriguez/activeadmin,waymondo/active_admin,vytenis-s/activeadmin,javierjulio/activeadmin,SoftSwiss/active_admin,waymondo/active_admin,mauriciopasquier/active_admin,cmunozgar/activeadmin,gogovan/activeadmin,gogovan/activeadmin,SoftSwiss/active_admin,cmunozgar/activeadmin,maysam/activeadmin,varyonic/activeadmin,deivid-rodriguez/activeadmin,siutin/activeadmin,wspurgin/activeadmin,wspurgin/activeadmin,javierjulio/activeadmin,deivid-rodriguez/activeadmin,waymondo/active_admin,vraravam/activeadmin,gogovan/activeadmin,activeadmin/activeadmin,vraravam/activeadmin