Wrap around in `rand_batched_kernel!` can lead to repeating patterns

MWE:

```julia-repl
julia> using GPUArrays, JLArrays, Random

julia> rng = GPUArrays.RNG{JLArray}(42)
GPUArrays.RNG{JLArray}(0x000000000000002a, 0x00000000)

julia> A = JLArray{UInt8}(undef, Int64(2)^34 + 8);

julia> Random.rand!(rng, A);

julia> A[end-7:end] == A[1:8]
true
```