refactor: Remove needless inner type clone

[ritchie46]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 8 lines in your changes missing coverage. Please review.

Project coverage is 81.47%. Comparing base (520c268) to head (5a4f61f).

Files	Patch %	Lines
...tes/polars-ops/src/chunked_array/list/namespace.rs	41.66%	7 Missing ⚠️
crates/polars-expr/src/expressions/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16718      +/-   ##
==========================================
- Coverage   81.48%   81.47%   -0.01%     
==========================================
  Files        1415     1415              
  Lines      186724   186721       -3     
  Branches     3018     3018              
==========================================
- Hits       152146   152139       -7     
- Misses      34046    34050       +4     
  Partials      532      532              

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[codspeed-hq]

CodSpeed Performance Report

Merging #16718 will improve performances by 18.18%

_{Comparing borrowed (5a4f61f) with main (520c268)}

Summary

⚡ 1 improvements
✅ 36 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	borrowed	Change
⚡	test_groupby_h2oai_q1	2.6 ms	2.2 ms	+18.18%