scratch3to2: fix cat ears - #8735

Resolves #8731

Changes

Fixes the styling of profile pictures, specifically those with cat ears (membership badge).

Tests

Tested on Edge and Firefox. I used the following code to add ears to every profile picture on the page:

for (const wrapper of document.querySelectorAll(".avatar-wrapper")) {
    wrapper.classList.add("avatar-badge-wrapper");
    wrapper.querySelector(".avatar").classList.add("avatar-badge");
}