bhspinmag fix

[katiebreivik]

I've made a tiny fix to ran3's definition in assign_remnant.f as real rather than real*8 in the bhspin function. This should fix #794 and hopefully not change behavior in the tests 🤞

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.31%. Comparing base (8772c07) to head (d315d17).
⚠️ Report is 169 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop     #795       +/-   ##
============================================
- Coverage    86.91%   76.31%   -10.60%     
============================================
  Files           40       58       +18     
  Lines        25542    28097     +2555     
  Branches         0      919      +919     
============================================
- Hits         22198    21440      -758     
- Misses        3344     6353     +3009     
- Partials         0      304      +304     

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