count_nested: Update series name directly

[dougbrn]

Change Description

Resolves #126. A small fix that is needed for the fornax demo.

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[github-actions]

Before [bcaf1b8]	After [daf1df2]	Ratio	Benchmark (Parameter)
1.09±0ms	1.12±0.02ms	1.03	benchmarks.NestedFrameReduce.time_run
6.15±0.06ms	6.29±0.04ms	1.02	benchmarks.NestedFrameQuery.time_run
264M	263M	1	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
86.9M	86.9M	1	benchmarks.NestedFrameAddNested.peakmem_run
8.90±0.07ms	8.92±0.1ms	1	benchmarks.NestedFrameAddNested.time_run
91.3M	91.3M	1	benchmarks.NestedFrameQuery.peakmem_run
90.1M	90.1M	1	benchmarks.NestedFrameReduce.peakmem_run
286M	287M	1	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
31.8±2ms	31.4±2ms	0.99	benchmarks.AssignSingleDfToNestedSeries.time_run
60.6±3ms	57.1±3ms	0.94	benchmarks.ReassignHalfOfNestedSeries.time_run

Click here to view all benchmarks.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.44%. Comparing base (3cd3baa) to head (b8bcf1c).
Report is 59 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #127   +/-   ##
=======================================
  Coverage   99.43%   99.44%           
=======================================
  Files          14       14           
  Lines         889      899   +10     
=======================================
+ Hits          884      894   +10     
  Misses          5        5           

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