Fix indexing ConcreteEvaluation with AbstractRange

[jishnub]

Fixes

julia> Evaluation(JacobiWeight(0,0,Chebyshev()), 0.5)[1:4]
4-element Vector{Float64}:
  1.0
  0.5
 -0.5
 -1.0

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (6f0cf81) 70.54% compared to head (85d2da8) 70.54%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #488   +/-   ##
=======================================
  Coverage   70.54%   70.54%           
=======================================
  Files          81       81           
  Lines        8477     8478    +1     
=======================================
+ Hits         5980     5981    +1     
  Misses       2497     2497           

Impacted Files	Coverage Δ
src/Operators/functionals/Evaluation.jl	88.17% <100.00%> (+0.12%)	⬆️

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