Recurse adapt

Needs a test case to really know if this is right. Thinking of GPUArrays, you can't have a GPUArray of GPUArrays so it should be an Array of GPUArrays

Author: ChrisRackauckas

src/vector_of_array.jl

@@ -143,7 +143,7 @@ end
 Base.convert(::Type{AbstractArray}, VA::AbstractVectorOfArray) = stack(VA.u)
 
 function Adapt.adapt_structure(to, VA::AbstractVectorOfArray)
-    Adapt.adapt(to, Array(VA))
+    Adapt.adapt.(to, VA.u)
 end
 
 function VectorOfArray(vec::AbstractVector{T}, ::NTuple{N}) where {T, N}