[BugFix] Add order_by in request data for leaderboard API call

[Ram81]

Description

This PR fixes this issue -

• Add order_by key in request data for leaderboard API calls for multi metric leaderboard.

[codecov-commenter]

Codecov Report

Merging #3579 (b9566a7) into master (96968d6) will decrease coverage by 1.42%.
The diff coverage is 33.52%.

@@            Coverage Diff             @@
##           master    #3579      +/-   ##
==========================================
- Coverage   72.93%   71.50%   -1.43%     
==========================================
  Files          83       20      -63     
  Lines        5368     3239    -2129     
==========================================
- Hits         3915     2316    -1599     
+ Misses       1453      923     -530     

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	⬇️
frontend/src/js/controllers/profileCtrl.js	79.76% <20.00%> (-13.10%)	⬇️
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	⬇️
frontend/src/js/controllers/challengeCtrl.js	63.51% <32.16%> (-10.19%)	⬇️
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	⬇️
frontend/src/js/controllers/challengeListCtrl.js	95.74% <50.00%> (+1.06%)	⬆️
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	⬇️
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 30 more

Impacted Files	Coverage Δ
frontend/src/js/controllers/authCtrl.js	53.91% <6.38%> (-12.95%)	⬇️
frontend/src/js/controllers/profileCtrl.js	79.76% <20.00%> (-13.10%)	⬇️
frontend/src/js/controllers/permissionCtrl.js	36.36% <22.22%> (-63.64%)	⬇️
frontend/src/js/controllers/challengeCtrl.js	63.51% <32.16%> (-10.19%)	⬇️
frontend/src/js/controllers/updateProfileCtrl.js	82.55% <44.44%> (-10.30%)	⬇️
frontend/src/js/controllers/challengeListCtrl.js	95.74% <50.00%> (+1.06%)	⬆️
...ntend/src/js/controllers/challengeHostTeamsCtrl.js	70.50% <66.66%> (-1.18%)	⬇️
frontend/src/js/controllers/teamsCtrl.js	71.17% <75.00%> (ø)
frontend/src/js/controllers/ChallengeInviteCtrl.js	100.00% <100.00%> (ø)
frontend/src/js/controllers/SubmissionFilesCtrl.js	95.45% <100.00%> (ø)
... and 30 more

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[Ram81]

@RishabhJain2018 can you review this PR. It fixes this issue