fix: [Message] use circle avatar

Author: akai

src/components/Message/Message.tsx

@@ -70,9 +70,7 @@ const Message = (props: MessageProps) => {
         </div>
       )}
       <div className="Message-content" role="alert" aria-live="assertive" aria-atomic="false">
-        {user && user.avatar && (
-          <Avatar src={user.avatar} shape="square" alt={user.name} url={user.url} />
-        )}
+        {user && user.avatar && <Avatar src={user.avatar} alt={user.name} url={user.url} />}
         {type === 'typing' ? <Typing /> : renderMessageContent(msg)}
       </div>
     </div>