[Makie] `stackhist` doesn't fill properly under yscale=log

[Moelf]

trafficstars

using FHist, CairoMakie

begin
       h1 = Hist1D(randn(10000); binedges=-3:0.1:3)
       h2 = Hist1D(randn(10000), binedges=-3:0.1:3)
       fig = Figure()
       ax = Axis(fig[1,1], yscale=log10)
       stackedhist!(ax, [h1, h2])
       current_figure()
end

cc. @mfarrington1