fix: StreamItem fails to render when no unread data is loaded
fix: StreamItem fails to render when no unread data is loaded

Remove the `unreadCount &&` check that is not even needed as
<UnreadCount /> component handles empty values by not rendering.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile