Avi follow experiment tweaks (#4341)

* Move avi button to visually align content

* Fix wrong prop warning

* Remove avi follow from post thread

src/view/com/posts/AviFollowButton.web.tsx

@@ -1 +1,5 @@
-export {Fragment as AviFollowButton} from 'react'
+import React from 'react'
+
+export function AviFollowButton({children}: {children: React.ReactNode}) {
+  return children
+}