Fix typo in numerical.py

[rgsl888prabhu]

closes #6778

Fixes typo missed in PR #6887, the else condition where this is situated would be the last resort for any unaccounted scalar type values.

[rgsl888prabhu]

rerun tests

[rgsl888prabhu]

rerun tests

[codecov]

Codecov Report

Merging #6957 (b34d514) into branch-0.18 (5336301) will increase coverage by 0.06%.
The diff coverage is 95.85%.

@@               Coverage Diff               @@
##           branch-0.18    #6957      +/-   ##
===============================================
+ Coverage        81.96%   82.03%   +0.06%     
===============================================
  Files               96       96              
  Lines            16177    16260      +83     
===============================================
+ Hits             13260    13339      +79     
- Misses            2917     2921       +4     

Impacted Files	Coverage Δ
python/cudf/cudf/io/avro.py	78.57% <66.66%> (-3.25%)	⬇️
python/cudf/cudf/io/csv.py	93.75% <66.66%> (-2.00%)	⬇️
python/cudf/cudf/io/json.py	96.55% <66.66%> (-3.45%)	⬇️
python/cudf/cudf/io/orc.py	88.40% <66.66%> (-0.99%)	⬇️
python/cudf/cudf/utils/ioutils.py	78.71% <80.00%> (-1.18%)	⬇️
python/cudf/cudf/core/index.py	93.25% <93.75%> (+<0.01%)	⬆️
python/cudf/cudf/utils/utils.py	85.35% <93.75%> (+0.67%)	⬆️
python/cudf/cudf/core/dataframe.py	91.08% <97.29%> (-0.07%)	⬇️
python/cudf/cudf/core/column/categorical.py	93.33% <100.00%> (-0.04%)	⬇️
python/cudf/cudf/core/column/column.py	87.92% <100.00%> (+0.21%)	⬆️
... and 13 more

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