[IIRR-41] Preserve filters when cloning archived puzzle

[JuanVqz]

Summary

• Clone action on archived puzzles redirected to the bare index, dropping the active filters (low_success_rate, hide_cloned_puzzles) and forcing the user to re-apply them between clones.
• Swap redirect_to puzzles_path for redirect_back fallback_location: puzzles_path in Puzzles::ClonesController#create so the user lands back on the same filtered view.

Test plan

• bin/rails test test/controllers/puzzles/clones_controller_test.rb
• Manually: enable a filter on Archived Puzzles, click Clone, confirm filter still applied.