Standings page - Add sort & sort_order

[manoharreddyporeddy]

Thanks for the work on clist @aropan

=== It will be interesting feature to add sort & sort_order to Standings page

Existing URL https://clist.by/standings/biweekly-contest-117-47614333/

Below URLs do not sort, as of today

https://clist.by/standings/biweekly-contest-117-47614333/?&sort_order=desc&sort=predicted_rating_change OR https://clist.by/standings/weekly-contest-371-47614332/?field=predicted_rating_change&sort_order=desc&sort=predicted_rating_change

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Should be easy fix as it is there is in other pages already Very useful to see interesting facts perf & rating changes & know how these are achieved