Backport: Fix ProductFun constructor ambiguity

[jishnub]

No description provided.

[codecov]

Codecov Report

Patch coverage: 62.96% and project coverage change: +0.17% 🎉

Comparison is base (42a2c04) 71.00% compared to head (01ca0b3) 71.17%.
Report is 3 commits behind head on backport_0.8.

Additional details and impacted files

@@               Coverage Diff                @@
##           backport_0.8     #548      +/-   ##
================================================
+ Coverage         71.00%   71.17%   +0.17%     
================================================
  Files                81       81              
  Lines              8575     8591      +16     
================================================
+ Hits               6089     6115      +26     
+ Misses             2486     2476      -10     

Files Changed	Coverage Δ
src/LinearAlgebra/lyap.jl	0.00% <0.00%> (ø)
src/Multivariate/VectorFun.jl	57.73% <0.00%> (ø)
src/Multivariate/ProductFun.jl	54.59% <60.00%> (+8.69%)	⬆️
src/PDE/KroneckerOperator.jl	78.43% <85.71%> (+0.11%)	⬆️
src/Operators/Operator.jl	73.95% <100.00%> (-0.06%)	⬇️
src/Operators/banded/Conversion.jl	80.00% <100.00%> (-3.88%)	⬇️
src/Operators/general/algebra.jl	90.12% <100.00%> (ø)

... and 2 files with indirect coverage changes

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