Don't apply RemoveRelationCopies transformer to EQRELs

[langston-barrett]

Fixes #2243

[codecov]

Codecov Report

Merging #2244 (2a7b6d0) into master (042ab12) will decrease coverage by 1.88%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2244      +/-   ##
==========================================
- Coverage   75.79%   73.90%   -1.89%     
==========================================
  Files         454      454              
  Lines       27588    27591       +3     
==========================================
- Hits        20910    20392     -518     
- Misses       6678     7199     +521     

Impacted Files	Coverage Δ
src/ast/transform/MagicSet.cpp	91.93% <ø> (+0.12%)	⬆️
src/ast/transform/MinimiseProgram.cpp	100.00% <100.00%> (ø)
src/ast/transform/RemoveRelationCopies.cpp	100.00% <100.00%> (ø)
src/main.cpp	67.43% <100.00%> (ø)
src/ram/utility/Utils.h	100.00% <100.00%> (ø)
src/interpreter/EqrelIndex.cpp	0.00% <0.00%> (-100.00%)	⬇️
src/include/souffle/datastructure/PiggyList.h	0.00% <0.00%> (-100.00%)	⬇️
src/include/souffle/datastructure/UnionFind.h	0.00% <0.00%> (-95.61%)	⬇️
...nclude/souffle/datastructure/EquivalenceRelation.h	0.00% <0.00%> (-76.77%)	⬇️
src/include/souffle/datastructure/LambdaBTree.h	0.00% <0.00%> (-73.29%)	⬇️
... and 14 more

[b-scholz]

Thanks for the fix!