Policy without role get's treten as public-policy

[Dominic-Marcelino]

Describe the bug
The extension uses a custom flag _sync_default_public_policy for the default public policy. However, after a custom policy is added which isn't related to a role (but assigned to a single user), the extension tries to save it as a second default public policy on a pull, which creates the error below:

insert into `directus_sync_id_map` (`local_id`, `sync_id`, `table`) values ('25c4d514-026a-400d-beeb-398b078b8ea6', '_sync_default_public_policy', 'policies') - Duplicate entry 'policies-_sync_default_public_policy' for key 'directus_sync_id_map_table_sync_id_unique'

After adding the policy manually to the directus_sync_id_map table (keeping the id), everything works as expected.

To Reproduce
Steps to reproduce the behavior:

1. Create a policy which isn't assigned to a role
2. Run directus-sync pull
3. See error

Expected behavior
Recognize that it's a user-related policy.

Versions (please complete the following information):

• Directus-Sync version: 3.0.3
• Directus version: 11.6.1
• Database: MySql
• Directus environment: Docker

[EdouardDem]

@Dominic-Marcelino Thanks for reporting the bug. I will work on this.