fix(SidebarMenu/WechatFriends): 修复头像显示逻辑，优先展示chatroomAvatar

当contact.avatar不存在时，现在会尝试使用contact.chatroomAvatar作为头像来源

Cunkebao/src/pages/pc/ckbox/components/SidebarMenu/WechatFriends/index.tsx

@@ -37,8 +37,12 @@ const ContactListSimple: React.FC<WechatFriendsProps> = ({
     >
       <div className={styles.avatarContainer}>
         <Avatar
-          src={contact.avatar}
-          icon={!contact.avatar && <span>{contact.nickname.charAt(0)}</span>}
+          src={contact.avatar || contact.chatroomAvatar}
+          icon={
+            !(contact.avatar || contact.chatroomAvatar) && (
+              <span>{contact.nickname.charAt(0)}</span>
+            )
+          }
           className={styles.avatar}
         />
       </div>