Fix adjoint cuarray dispatch

[GiggleLiu]

The following test case now works:

@testset "adjoint dispatch" begin
    u = CUDA.rand(2,2); A = CUDA.rand(2,2,3);
    @test Array(ein"(ip,pql),qj -> ijl"(u', A, u)) ≈ ein"(ip,pql),qj -> ijl"(Array(CuArray(u')), Array(A), Array(u))
end``

[codecov-commenter]

Codecov Report

Merging #141 (a436697) into master (1d4ea9a) will decrease coverage by 0.55%.
The diff coverage is 18.18%.

❗ Current head a436697 differs from pull request most recent head b84f7ec. Consider uploading reports for the commit b84f7ec to get more accurate results

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   89.30%   88.75%   -0.56%     
==========================================
  Files          14       14              
  Lines        1085     1094       +9     
==========================================
+ Hits          969      971       +2     
- Misses        116      123       +7     

Impacted Files	Coverage Δ
src/cueinsum.jl	2.89% <18.18%> (+2.89%)	⬆️

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