[Lightbox] Add border radius to avatars (#6136)

* Preserve shape in lightbox

* Rename shapes to semantic meanings

It looks like after all I do want to fork based on those.

* Round avatars on the web

* Oops

src/view/com/profile/ProfileSubpageHeader.tsx

@@ -80,6 +80,7 @@ export function ProfileSubpageHeader({
               height: 1000,
               width: 1000,
             },
+            type: 'rect-avi',
           },
         ],
         index: 0,