symbolics: evaluate transpose on elements of tensors in case of deriv…

[mloubout]

Fixes #2071

[codecov]

Codecov Report

Merging #2072 (2edeac6) into master (1d4b9ca) will increase coverage by 0.00%.
The diff coverage is 96.77%.

@@           Coverage Diff           @@
##           master    #2072   +/-   ##
=======================================
  Coverage   87.78%   87.79%           
=======================================
  Files         224      224           
  Lines       38711    38740   +29     
  Branches     5821     5826    +5     
=======================================
+ Hits        33982    34011   +29     
- Misses       4177     4179    +2     
+ Partials      552      550    -2     

Impacted Files	Coverage Δ
devito/types/basic.py	93.77% <85.71%> (-0.09%)	⬇️
examples/seismic/elastic/operators.py	100.00% <100.00%> (ø)
examples/seismic/viscoelastic/operators.py	100.00% <100.00%> (ø)
tests/test_tensors.py	94.68% <100.00%> (+0.63%)	⬆️
devito/ir/support/basic.py	92.79% <0.00%> (-0.19%)	⬇️
devito/finite_differences/derivative.py	96.51% <0.00%> (+1.16%)	⬆️

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[FabioLuporini]

uncontroversial