Pass field to ConvertToMatrixRep in more cases

[fingolfin]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 80.95238% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.55%. Comparing base (72e7a85) to head (29244d5).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
gap/projective/tensor.gi	63.63%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #370   +/-   ##
=======================================
  Coverage   71.55%   71.55%           
=======================================
  Files          43       43           
  Lines       18398    18399    +1     
=======================================
+ Hits        13164    13165    +1     
  Misses       5234     5234           

Files with missing lines	Coverage Δ
gap/projective/c3c5.gi	86.83% <100.00%> (ø)
gap/projective/classicalnatural.gi	87.79% <100.00%> (ø)
gap/projective/d247.gi	81.29% <100.00%> (ø)
gap/projective/tensor.gi	56.54% <63.63%> (+0.20%)	⬆️

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