[projmgr] Fix list packs --missing

[grasci-arm]

Fix regression introduced in #2342

[github-actions]

Test Results

    3 files     21 suites   14m 8s ⏱️
  447 tests   447 ✅ 0 💤 0 ❌
1 341 runs  1 341 ✅ 0 💤 0 ❌

Results for commit 52ca916.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.43%. Comparing base (2c82324) to head (52ca916).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2348      +/-   ##
==========================================
- Coverage   64.43%   64.43%   -0.01%     
==========================================
  Files         145      145              
  Lines       26008    26007       -1     
  Branches    15675    15675              
==========================================
- Hits        16759    16758       -1     
  Misses       7084     7084              
  Partials     2165     2165              

Flag	Coverage Δ
projmgr-cov	87.30% <100.00%> (-0.01%)	⬇️

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Files with missing lines	Coverage Δ
tools/projmgr/src/ProjMgrWorker.cpp	88.05% <100.00%> (-0.01%)	⬇️

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