Revert "Fix floattype() for non-concrete types"

[kimikage]

Reverts #354

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.75%. Comparing base (e08cf98) to head (5c2bed1).

Files with missing lines	Patch %	Lines
src/deprecations.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #361      +/-   ##
==========================================
- Coverage   97.11%   96.75%   -0.37%     
==========================================
  Files           7        7              
  Lines         796      800       +4     
==========================================
+ Hits          773      774       +1     
- Misses         23       26       +3     

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