Fix rendering of target color on contest page

[Balint-R]

Fixes #1881.

[int-y1]

Looks like !important is still needed to display the disqualify icon correctly.

[codecov-commenter]

Codecov Report

Base: 46.66% // Head: 46.67% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (4d4d3e5) compared to base (69d5907).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2124   +/-   ##
=======================================
  Coverage   46.66%   46.67%           
=======================================
  Files         240      240           
  Lines       13259    13261    +2     
=======================================
+ Hits         6187     6189    +2     
  Misses       7072     7072           

Impacted Files	Coverage Δ
judge/utils/unicode.py	56.00% <0.00%> (+3.82%)	⬆️

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[Xyene]

LGTM, thanks!