Add-ons [TH] Covers 1.1.1 Patch Level 3

Changes:

• Fixes an issue that may have made thread controls inaccessible after cover was deleted
• Fixes an issue that causes a PHP 8 incompatibility error

Changes:

• Automatically syncs resource covers to the associated thread

Changes:

• Fixed an issue that caused the "No" status from being followed on Cover based user group permissions
• Fixed an issue that kept moderators from being able to set a new cover or change them even when they have the appropriate user group permissions to do so