Fix dictionary size computation in ORC writer

[vuule]

Fixes #7661

Corrects the field order in std::accumulate that computes the string column size w.r.t encoding.

[devavret]

Issue not filed

Fixes #7661

[vuule]

rerun tests

[codecov]

Codecov Report

Merging #7737 (9a08dcf) into branch-0.19 (7871e7a) will increase coverage by 0.65%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.19    #7737      +/-   ##
===============================================
+ Coverage        81.86%   82.52%   +0.65%     
===============================================
  Files              101      101              
  Lines            16884    17458     +574     
===============================================
+ Hits             13822    14407     +585     
+ Misses            3062     3051      -11     

Impacted Files	Coverage Δ
python/cudf/cudf/utils/gpu_utils.py	53.65% <0.00%> (-4.88%)	⬇️
python/cudf/cudf/core/column/lists.py	87.68% <0.00%> (-3.72%)	⬇️
python/cudf/cudf/core/column/decimal.py	92.95% <0.00%> (-1.92%)	⬇️
python/cudf/cudf/core/abc.py	87.23% <0.00%> (-1.14%)	⬇️
python/cudf/cudf/core/column/numerical.py	94.83% <0.00%> (-0.20%)	⬇️
python/cudf/cudf/core/column/column.py	87.61% <0.00%> (-0.15%)	⬇️
python/cudf/cudf/utils/utils.py	85.36% <0.00%> (-0.07%)	⬇️
python/cudf/cudf/io/feather.py	100.00% <0.00%> (ø)
python/cudf/cudf/utils/ioutils.py	78.71% <0.00%> (ø)
python/cudf/cudf/comm/serialize.py	0.00% <0.00%> (ø)
... and 45 more

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[vuule]

@gpucibot merge