Fix pack_lists for multiple-chunk series

[hombit]

Closes #180

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.43%. Comparing base (3cb19bd) to head (5d39c52).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #181   +/-   ##
=======================================
  Coverage   99.43%   99.43%           
=======================================
  Files          13       13           
  Lines        1062     1071    +9     
=======================================
+ Hits         1056     1065    +9     
  Misses          6        6           

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[github-actions]

Before [3cb19bd]	After [a8c41a0]	Ratio	Benchmark (Parameter)
43.9±8ms	31.8±8ms	~0.73	benchmarks.ReassignHalfOfNestedSeries.time_run
23.1±0.5ms	23.3±0.1ms	1.01	benchmarks.AssignSingleDfToNestedSeries.time_run
15.1±0.1ms	15.2±0.2ms	1.01	benchmarks.NestedFrameQuery.time_run
263M	264M	1.00	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
85.8M	86.1M	1.00	benchmarks.NestedFrameAddNested.peakmem_run
90.8M	91M	1.00	benchmarks.NestedFrameQuery.peakmem_run
89.4M	89.8M	1.00	benchmarks.NestedFrameReduce.peakmem_run
283M	283M	1.00	benchmarks.ReassignHalfOfNestedSeries.peakmem_run
1.43±0.01ms	1.42±0.02ms	0.99	benchmarks.NestedFrameReduce.time_run
9.43±0.1ms	9.23±0.05ms	0.98	benchmarks.NestedFrameAddNested.time_run

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