show on sparse adjoints displays dense output

[ViralBShah]

Sparse adjoints display like dense matrices rather than sparse matrices:

julia> sprand(10,10,0.5)'
10×10 LinearAlgebra.Adjoint{Float64,SparseMatrixCSC{Float64,Int64}}:
 0.653713   0.0       0.0       0.0       …  0.0        0.132038  0.994473
 0.376673   0.0       0.93067   0.0          0.0        0.889498  0.11722
 0.0        0.0       0.331756  0.0          0.301708   0.68326   0.0
 0.491798   0.0       0.847417  0.0          0.0239453  0.0       0.66232
 0.0        0.457921  0.818687  0.0          0.872932   0.705145  0.42251
 0.0        0.183566  0.0       0.803265  …  0.0        0.929449  0.153552
 0.0        0.0       0.34864   0.0          0.0301167  0.471377  0.277341
 0.0537803  0.183686  0.731216  0.0          0.235513   0.91812   0.0
 0.0        0.845597  0.200048  0.0          0.485561   0.151832  0.768555
 0.0        0.985808  0.756742  0.0          0.595492   0.801145  0.356078

[ViralBShah]

We need the adjoints to go through the same code path as the rest of the sparse matrix display. We aren't getting the nice terminal plots here.

Cc @dkarrasch @goggle