Don't store ring modulus in multiple places

[fingolfin]

No description provided.

[lgoettgens]

I like this! But unfortunately, there seem to be more places that access the now removed field

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.39%. Comparing base (8e3aea0) to head (a6624ae).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2192      +/-   ##
==========================================
+ Coverage   88.25%   88.39%   +0.13%     
==========================================
  Files          99       99              
  Lines       37056    37929     +873     
==========================================
+ Hits        32705    33526     +821     
- Misses       4351     4403      +52     

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