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

[xiaowuc1]

Disqualified participations preserve the old cumtime 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 #1752 (d1b2fdd) into master (0c009fa) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1752      +/-   ##
==========================================
+ Coverage   46.03%   46.23%   +0.19%     
==========================================
  Files         213      222       +9     
  Lines       12159    12613     +454     
==========================================
+ Hits         5597     5831     +234     
- Misses       6562     6782     +220     

Impacted Files	Coverage Δ
judge/models/contest.py	95.49% <100.00%> (+0.16%)	⬆️
judge/views/ranked_submission.py	37.25% <0.00%> (-7.75%)	⬇️
judge/models/profile.py	86.84% <0.00%> (-5.33%)	⬇️
judge/forms.py	44.32% <0.00%> (-3.98%)	⬇️
judge/signals.py	64.19% <0.00%> (-3.81%)	⬇️
judge/jinja2/social.py	68.42% <0.00%> (-3.81%)	⬇️
judge/views/ticket.py	39.44% <0.00%> (-1.12%)	⬇️
judge/social_auth.py	41.55% <0.00%> (-0.75%)	⬇️
judge/views/register.py	50.70% <0.00%> (-0.69%)	⬇️
judge/views/submission.py	32.17% <0.00%> (-0.49%)	⬇️
... and 42 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0c009fa...d1b2fdd. Read the comment docs.