Fix module eval (example 41)

[t-bltg]

Fixes the following

julia> using Plots
julia> Plots.test_examples(:unicodeplots, 41, disp=true)
ERROR: LoadError: type IdOffsetRange has no field stop
Stacktrace:
  [1] getproperty(x::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}}, f::Symbol)
    @ Base ./Base.jl:33
  [2] last(r::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}})
    @ Base ./range.jl:613
  [3] length
    @ ./range.jl:586 [inlined]
  [4] size(r::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}})
    @ Base ./range.jl:515
  [5] axes
    @ ./abstractarray.jl:89 [inlined]
  [6] similar(a::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}}, #unused#::Type{Float64})
    @ Base ./abstractarray.jl:739
  [7] AbstractVector{Float64}(A::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}})
    @ Base ./array.jl:541
  [8] (AbstractArray{Float64, N} where N)(A::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}})
    @ Core ./boot.jl:475
  [9] convert(#unused#::Type{AbstractArray{Float64, N} where N}, a::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}})
    @ Base ./abstractarray.jl:15
 [10] float(A::OffsetArrays.IdOffsetRange{Int64, Base.OneTo{Int64}})
    @ Base ./float.jl:896
[...]

[codecov]

Codecov Report

Merging #4093 (bda951e) into master (2a7d2d7) will increase coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #4093      +/-   ##
==========================================
+ Coverage   62.22%   62.23%   +0.01%     
==========================================
  Files          29       29              
  Lines        7295     7293       -2     
==========================================
  Hits         4539     4539              
+ Misses       2756     2754       -2     

Impacted Files	Coverage Δ
src/examples.jl	63.63% <0.00%> (+1.87%)	⬆️
src/backends/gr.jl	88.27% <0.00%> (-0.09%)	⬇️
src/types.jl	52.17% <0.00%> (+4.34%)	⬆️

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