Remove recently_attempted_problems

[int-y1]

dead code

[codecov-commenter]

Codecov Report

Base: 46.65% // Head: 46.65% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (d714584) compared to base (439e928).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2088   +/-   ##
=======================================
  Coverage   46.65%   46.65%           
=======================================
  Files         238      238           
  Lines       13250    13245    -5     
=======================================
- Hits         6182     6180    -2     
+ Misses       7068     7065    -3     

Impacted Files	Coverage Δ
dmoj/settings.py	97.72% <ø> (-0.02%)	⬇️
judge/views/blog.py	42.46% <ø> (+0.90%)	⬆️

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