yet more piracy due to QuantumInterface, this time in `copyto!`

[Krastanov]

trafficstars

Aqua started detecting this recently, not sure what caused it to appear only now. I will go ahead and fix it.

Possible type-piracy detected:
[4] copyto!(A::T, B::T) where T<:StateVector @ QuantumOpticsBase ~/Documents/ScratchSpace/quantumjulia/QuantumOpticsBase.jl/src/states.jl:253