bug involving broadcast and vector ctranspose

[StefanKarpinski]

I was trying to give a motivating example in #20978 and encountered this issue:

julia> m(z::Complex) = [z.re -z.im; z.im z.re]
m (generic function with 1 method)

julia> v = [1+2im]'
1×1 RowVector{Complex{Int64},ConjArray{Complex{Int64},1,Array{Complex{Int64},1}}}:
 1-2im

julia> (m.(v))[1]
2×2 Array{Int64,2}:
 1  -2
 2   1

julia> m(v[1])
2×2 Array{Int64,2}:
  1  2
 -2  1