Pictures permission with copy paste not set #1287

Describe the bug
When a user add directly with copy & paste in the editor a picture, the picture is visible for all users.

Steps To Reproduce
Steps to reproduce the behavior:

1. Create two role that allows only to edit / delete own images and add user A to role A and user B to role B
2. login with user A
3. Create or edit a page
4. Copy a picture with copy and paste
5. save the page
6. login with user B
7. Create or edit a page
8. Insert a picture
9. You will see the picture from User A

Expected behavior
User B shouldn't see the picture of User A.
When the User A uses the picture upload function, then User B can't see the picture that User A uploaded.

Your Configuration (please complete the following information):

• Exact BookStack Version (Found in settings): v0.25.1
• PHP Version: 7.3
• Hosting Method (Nginx/Apache/Docker): Apache