CUTENSOR fixes on Windows

[maleadt]

The indices were a legitimate bug. Pinned memory doesn't work, so I just disabled that on Windows for now. @kshyatt any idea why pinned memory + CUTENSOR wouldn't work on Windows?
Probably fixes #422.

[codecov]

Codecov Report

Merging #519 into master will increase coverage by 0.07%.
The diff coverage is 99.35%.

@@            Coverage Diff             @@
##           master     #519      +/-   ##
==========================================
+ Coverage   80.51%   80.58%   +0.07%     
==========================================
  Files         166      166              
  Lines        8889     8911      +22     
==========================================
+ Hits         7157     7181      +24     
+ Misses       1732     1730       -2     

Impacted Files	Coverage Δ
lib/cutensor/tensor.jl	83.33% <50.00%> (-8.34%)	⬇️
lib/cutensor/interfaces.jl	100.00% <100.00%> (ø)
lib/cutensor/wrappers.jl	93.90% <100.00%> (+0.09%)	⬆️
test/cutensor/contractions.jl	100.00% <100.00%> (ø)
test/cutensor/elementwise_binary.jl	100.00% <100.00%> (ø)
test/cutensor/elementwise_trinary.jl	97.10% <100.00%> (+0.17%)	⬆️
test/cutensor/permutations.jl	100.00% <100.00%> (ø)
test/cutensor/reductions.jl	100.00% <100.00%> (ø)
src/pool.jl	74.16% <0.00%> (+1.25%)	⬆️

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