[BUG] Annoymous Read/Write can bypass permissions

Description:

Annoymous Read/Write can bypass permissions

#10685 related

Steps to reproduce:

1. Enable Anonymous Read and Anonymous Write

2. Create a public channel with join code

3. Remove preview channel permission for anonymous role

4. Click this channel as anonymous user (still be able to preview the content)

5. Enable Anonymous Read and Anonymous Write

6. Delete all public rooms

7. Registered user cannot sign-in because there is no button!

8. Enable Anonymous Read and Anonymous Write

9. Create a public channel

10. Remove all permissions for guest and anonymous user

11. Browse the website as anonymous user(you can still see all public channels. But if you click on one channel , click "join as anonymous", input anonymous name , you will find that you cannot join them or see any public channel )

Server Setup Information:

• Version of Rocket.Chat Server: 1.2.1
• Deployment Method:
• Number of Running Instances: 1