Fix Bernstein Fun

[jishnub]

Fixes

julia> Fun(Bernstein{1}())
Fun(Bernstein{1, ChebyshevInterval{Float64}, Float64}(-1.0..1.0 (Chebyshev)), [-1.0, 1.0])

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: +0.76 🎉

Comparison is base (441f970) 70.36% compared to head (b7f74e4) 71.13%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
+ Coverage   70.36%   71.13%   +0.76%     
==========================================
  Files          28       28              
  Lines        2686     2688       +2     
==========================================
+ Hits         1890     1912      +22     
+ Misses        796      776      -20     

Impacted Files	Coverage Δ
src/Spaces/Ultraspherical/DirichletSpace.jl	48.64% <0.00%> (ø)
src/Spaces/CurveSpace.jl	25.58% <100.00%> (+25.58%)	⬆️

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