remove Ferrite.ndim(dh, fieldname)

[kimauth]

As the diff shows this was almost unused and also duplicate functionality of getfielddim.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01 ⚠️

Comparison is base (3baab3e) 92.99% compared to head (f7c05a7) 92.99%.

❗ Current head f7c05a7 differs from pull request most recent head 4c2636b. Consider uploading reports for the commit 4c2636b to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #658      +/-   ##
==========================================
- Coverage   92.99%   92.99%   -0.01%     
==========================================
  Files          30       30              
  Lines        4497     4496       -1     
==========================================
- Hits         4182     4181       -1     
  Misses        315      315              

Impacted Files	Coverage Δ
src/Dofs/DofHandler.jl	84.15% <ø> (-0.09%)	⬇️
src/Dofs/ConstraintHandler.jl	95.84% <100.00%> (ø)

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