Simplify float_variable_name (NEURON version).

[1uc]

We now understand better what we need, and can clean up the left over dead code from cloning the CoreNEURON method.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 86.83%. Comparing base (10788d7) to head (95655cd).

Files	Patch %	Lines
src/codegen/codegen_neuron_cpp_visitor.cpp	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1376      +/-   ##
==========================================
+ Coverage   86.82%   86.83%   +0.01%     
==========================================
  Files         179      179              
  Lines       13685    13683       -2     
==========================================
  Hits        11882    11882              
+ Misses       1803     1801       -2     

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[bbpbuildbot]

Logfiles from GitLab pipeline #224195 (:white_check_mark:) have been uploaded here!

Status and direct links:

• ✅ spack_setup
• ✅ build:intel
• ✅ build:nvhpc
• ✅ test:intel
• ✅ test:nvhpc