judge: fix str/bytes confusion in CompileError

[quantum5]

No description provided.

[codecov-commenter]

Codecov Report

Merging #930 (84bef29) into master (2ea839a) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #930      +/-   ##
==========================================
+ Coverage   86.61%   86.67%   +0.06%     
==========================================
  Files         138      138              
  Lines        4670     4729      +59     
==========================================
+ Hits         4045     4099      +54     
- Misses        625      630       +5     

Impacted Files	Coverage Δ
dmoj/error.py	93.33% <100.00%> (+1.66%)	⬆️
dmoj/judge.py	70.44% <100.00%> (ø)
dmoj/cptbox/tracer.py	83.27% <0.00%> (-1.82%)	⬇️
dmoj/result.py	89.33% <0.00%> (-1.34%)	⬇️
dmoj/utils/module.py	100.00% <0.00%> (ø)
dmoj/utils/error.py	93.33% <0.00%> (+2.42%)	⬆️
dmoj/utils/helper_files.py	95.18% <0.00%> (+3.51%)	⬆️
dmoj/utils/os_ext.py	94.73% <0.00%> (+6.27%)	⬆️
dmoj/utils/load.py	73.91% <0.00%> (+7.24%)	⬆️

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[Xyene]

LGTM