ARROW-6325: [Python] fix conversion of strided boolean arrays

[jorisvandenbossche]

https://issues.apache.org/jira/browse/ARROW-6325

Needed to flip the order of the strided / boolean check, as the strided code path was not specialized for boolean values, and the boolean code path already handled strided arrays fine.

[codecov-io]

Codecov Report

Merging #5176 into master will increase coverage by 1.88%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5176      +/-   ##
==========================================
+ Coverage   87.36%   89.24%   +1.88%     
==========================================
  Files         909      739     -170     
  Lines      122252   105417   -16835     
  Branches     1437        0    -1437     
==========================================
- Hits       106807    94081   -12726     
+ Misses      15083    11336    -3747     
+ Partials      362        0     -362

Impacted Files	Coverage Δ
python/pyarrow/tests/test_pandas.py	95.19% <100%> (ø)
python/pyarrow/tests/test_array.py	95.36% <100%> (ø)
cpp/src/arrow/python/numpy_to_arrow.cc	95.78% <100%> (ø)
go/arrow/math/uint64_amd64.go
go/arrow/memory/memory_avx2_amd64.go
rust/datafusion/src/execution/filter.rs
rust/arrow/src/csv/writer.rs
rust/datafusion/src/bin/main.rs
go/arrow/ipc/file_reader.go
js/src/builder/index.ts
... and 463 more

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[wesm]

+1