Fix windows airgap image packaging

[brandond]

Proposed Changes

Fix windows airgap image packaging

Change to image source for airgap was missed from #4829 - airgap no longer contained the same images as RKE2 actually uses on Windows.

Types of Changes

bugfix

Verification

Check windows airgap tarball
Install windows airgap cluster

Testing

Linked Issues

• Windows air-gap images.txt listing missing images #6579

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 25.18%. Comparing base (61fa274) to head (b9c7d5b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6580   +/-   ##
=======================================
  Coverage   25.18%   25.18%           
=======================================
  Files          33       33           
  Lines        2831     2831           
=======================================
  Hits          713      713           
  Misses       2071     2071           
  Partials       47       47           

Flag	Coverage Δ
inttests	9.57% <ø> (ø)
unittests	17.80% <ø> (ø)

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