🐛 fix permutation handling in QASM dump

[burgholzer]

Description

This PR fixes an oversight in #753 where the respective changes would sometimes create invalid output permutation dumps.
This surfaced as part of cda-tum/mqt-qmap#418.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.2%. Comparing base (5959931) to head (b712d27).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #810   +/-   ##
=====================================
  Coverage   92.2%   92.2%           
=====================================
  Files        126     126           
  Lines      13830   13832    +2     
  Branches    2153    2153           
=====================================
+ Hits       12760   12763    +3     
+ Misses      1070    1069    -1     

Flag	Coverage Δ
cpp	92.0% <100.0%> (+<0.1%)	⬆️
python	99.7% <ø> (ø)

Files with missing lines	Coverage Δ
src/ir/QuantumComputation.cpp	90.4% <100.0%> (+<0.1%)	⬆️

... and 1 file with indirect coverage changes