Fix steady state default algorithm test

[thomvet]

Test was failing. This is probably a ripple effect of changes in NonlinearSolve.jl, DifferentialEquations.NonlinearSolve.NewtonRaphson now points to a function (not a type anymore).

The change introduced compares the algorithm name instead of the type (using NonlinearSolve.get_name). The other way of fixing it would of course be to have the NonlinearSolve.NewtonRaphson also be a type instead of just a function (as it previously was).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.43%. Comparing base (6d05a21) to head (7eaf874).
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1019      +/-   ##
==========================================
- Coverage   86.09%   85.43%   -0.67%     
==========================================
  Files          11       11              
  Lines         151      151              
==========================================
- Hits          130      129       -1     
- Misses         21       22       +1     

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