Image Id is not set to zero after avatar is deleted. #3977

Describe the Bug

After resetting the avatar should be in the table image_id set to 0.

// BookStack\Http\Controllers\UserController
if ($request->has('profile_image_reset')) {
    $this->imageRepo->destroyImage($user->avatar);
    $user->image_id = 0; // added
    $user->save(); // added
}

Steps to Reproduce

Delete the avatar and check the users table.

Expected Behaviour

Zero in column image_id

Screenshots or Additional Context

No response

Browser Details

No response

Exact BookStack Version

22.11.1

PHP Version

No response

Hosting Environment

does not matter