Adapting between cpu and gpu spaces results in different types

[charleskawczynski]

#2187 adds some broken tests in test/Operators/finitedifference/unit_field.jl, which show that if we make a cpu and gpu space, then adapt the gpu space to the cpu, the two cpu spaces will have different types.

[Sbozzolo]

Due to JuliaGPU/Adapt.jl#92 in elemorder and orderindex in the topology