Fix error message in _filter_and_sort_leaderboard_df

[lucyleeow]

Fix lint which was causing CIs to fail:

rampwf/utils/command_line.py:413:21: F523 '...'.format(...) has unused arguments at position(s): 1 rampwf/utils/command_line.py:439:21: F523 '...'.format(...) has unused arguments at position(s): 1 The command "flake8 rampwf --ignore=F401,E211,E265,W503,W504 --exclude rampwf/externals" exited with 1.

[codecov[bot]]

Codecov Report

Merging #234 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   81.69%   81.69%           
=======================================
  Files         132      132           
  Lines        4889     4889           
=======================================
  Hits         3994     3994           
  Misses        895      895           

Impacted Files	Coverage Δ
rampwf/utils/command_line.py	57.39% <ø> (ø)

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[lgtm-com[bot]]

This pull request fixes 2 alerts when merging 7f197cfe9cb0d68335628ba6dc6364812cf51300 into 99d7d349b61e28eb70c1f5df8b86fb1261b15339 - view on LGTM.com

fixed alerts:

• 2 for Unused argument in a formatting call