Adjust tensor sizes to fix plasticity error

[davschneller]

Fixes #984 . Also, we remove references to NUMBER_OF_ALIGNED_BASIS_FUNCTIONS and replace them with the proper tensor sizes, to avoid potential future errors.

[davschneller]

However, note that I'm still not super happy with how the plasticity kernel looks at the moment (and it's hard-wired to an elastic setup)—we directly access the arrays; maybe it's more useful to copy them using tensor initializers, in case the structure changes in the future, but maybe that'll not be a problem... We'll see.

[codecov-commenter]

Codecov Report

Merging #985 (01e46d2) into master (73288b7) will increase coverage by 0.00%.
Report is 5 commits behind head on master.
The diff coverage is 0.00%.

❗ Current head 01e46d2 differs from pull request most recent head aa0c3ac. Consider uploading reports for the commit aa0c3ac to get more accurate results

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@@           Coverage Diff           @@
##           master     #985   +/-   ##
=======================================
  Coverage   14.35%   14.35%           
=======================================
  Files         253      253           
  Lines       14251    14250    -1     
=======================================
  Hits         2046     2046           
+ Misses      12205    12204    -1     

Files	Coverage Δ
src/Initializer/LTS.h	0.00% <ø> (ø)
src/ResultWriter/EnergyOutput.cpp	0.00% <ø> (ø)
src/Solver/time_stepping/TimeCluster.h	0.00% <0.00%> (ø)
src/Kernels/Plasticity.cpp	0.00% <0.00%> (ø)

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[Thomas-Ulrich]

see nevertheless my comment (not related with the PR)