All coeffs in fromtensor

[jishnub]

This fixes

julia> f(x,y) = x*y
f (generic function with 1 method)

julia> L = LowRankFun(f, Chebyshev() ⊗ Chebyshev())
LowRankFun on Chebyshev() ⊗ Chebyshev() of rank 1.

julia> F = Fun(L)
Fun(Chebyshev() ⊗ Chebyshev(), [0.0, 0.0, 0.0, 0.0, 1.0])

julia> L(0.1, 0.2) ≈ F(0.1, 0.2)
true

[codecov]

Codecov Report

Base: 71.43% // Head: 71.43% // No change to project coverage 👍

Coverage data is based on head (e5605a0) compared to base (93a0086).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #224   +/-   ##
=======================================
  Coverage   71.43%   71.43%           
=======================================
  Files          77       77           
  Lines        8020     8020           
=======================================
  Hits         5729     5729           
  Misses       2291     2291           

Impacted Files	Coverage Δ
src/Multivariate/TensorSpace.jl	75.68% <100.00%> (ø)

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