Fix reuse_models not using the custom_template_dir

[atti92]

If you try to use --custom-template-dir along with --reuse-model, The reused model is not using the same template as the original.

The initializer is missing the template dir on construction.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1954   +/-   ##
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  Coverage        ?   98.90%           
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  Files           ?       37           
  Lines           ?     4193           
  Branches        ?      975           
=======================================
  Hits            ?     4147           
  Misses          ?       29           
  Partials        ?       17           

Flag	Coverage Δ
unittests	98.56% <ø> (?)

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[codspeed-hq]

CodSpeed Performance Report

Merging #1954 will not alter performance

_{Comparing atti92:atti92-reuse-models2 (e817fd5) with main (5bab627)}

Summary

✅ 29 untouched benchmarks