For DQ'ed contest participations, set tiebreaker to zero unconditionally.

[xiaowuc1]

Disqualified participations preserve the old tiebreaker value which results in not all disqualified participations sharing the same rank. Having all of these be equal should force disqualified participations to share the same rank, which is a more intuitive ranking.

[codecov-commenter]

Codecov Report

Merging #1753 (d032e3d) into master (32fbbc1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1753   +/-   ##
=======================================
  Coverage   46.23%   46.23%           
=======================================
  Files         222      222           
  Lines       12613    12614    +1     
=======================================
+ Hits         5831     5832    +1     
  Misses       6782     6782           

Impacted Files	Coverage Δ
judge/models/contest.py	95.50% <100.00%> (+0.01%)	⬆️

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