fix: implement 'per user inherit' logic for folder delete permissions check

[icewind1991]

To test:

• Enable "per user inherit" with occ config:app:set groupfolders acl-inherit-per-user --value true
• Create groups G1 and G2
• Create user U1 that is a member of G1 and G2
• Create groupfolder F1 with full access for G1, G2 and admin and enable ACL for the groupfolder
• As admin create F1/Test
• As admin create an ACL rule for F1 which sets all permissions for G1 to allow
• As admin create an ACL rule for F1/Test which sets the delete for G2 to deny

At this point the output of occ groupfolders:permissions <folder id> should look like:

+------+------------+-----------------------------------------+
| Path | User/Group | Permissions                             |
+------+------------+-----------------------------------------+
| /    | group: G1  | +read, +write, +create, +delete, +share |
| Test | group: G2  | -delete                                 |
+------+------------+-----------------------------------------+

• As U1 try to delete F1/Test

Current behavior

Even though U1 sees the delete option, trying to delete the folder fails

New behavior

U1 can successfully delete the folder.

[icewind1991]

/backport to stable30

[icewind1991]

/backport to stable29