Incorrect eltype for `Base.OneTo(::StaticInt)`

Hi, I just noticed this, thought you'd want to know:
```julia
julia> eltype(Base.OneTo(static(3)))
StaticInt{3}
```

This fixes it:
```julia
julia> Base.eltype(::Base.OneTo{StaticInt{N}}) where {N} = Int

julia> eltype(Base.OneTo(static(3)))
Int64
```