Fix permissions on initiatives

[Stef-Rousset]

🎩 Description

This PR allows to create an initiative if there is no permission set on initiative type.

Testing

1. Perform the tests available in fix: Create Initiatives if no authorizations are activated in the system view #918
2. As an admin, go to /system and allow "Identity Verification Form (Direct)" and save
3. Log out and log in with the user you created on step 1
4. Go to the initiatives index in FO and click on new initiative
5. Ensure you can access the creation of initiative without authorization
6. As an admin, go in the BO to the initiatives, click on Manage and go to initiative types. Click on permissions and add a permission on create (cf screenshot)
7. Log out and log in as the user you created on step 1.
8. Go to the initiatives index in FO and click on new initiative
9. Ensure you have to be authorized to be able to create an initiative
10. As an admin, go in the BO to the initiatives, click on Manage and go to initiative types. Click on permissions, add a permission on sign and remove permission on create
11. Repeat steps 3 to 5

📌 Related Issues

• Fixes https://github.com/orgs/OpenSourcePolitics/projects/26/views/1?pane=issue&itemId=137142592&issue=OpenSourcePolitics%7Cintern-tasks%7C211

Tasks

• Add specs

Screenshots