Remove raw problem view

[kiritofeng]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1801 (e5307c2) into master (981018a) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1801   +/-   ##
=======================================
  Coverage   46.17%   46.18%           
=======================================
  Files         223      223           
  Lines       12683    12666   -17     
=======================================
- Hits         5857     5850    -7     
+ Misses       6826     6816   -10     

Impacted Files	Coverage Δ
dmoj/urls.py	89.74% <ø> (ø)
judge/views/problem.py	24.53% <ø> (-0.56%)	⬇️

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[int-y1]

Other places in the codebase use problem/raw.html -- make sure that pdf generation does not break

[Ninjaclasher]

Don't forget about the robots.txt entry.