[release-1.28] Fix hosts.toml header var

[brandond]

Proposed Changes

Resolves issue from 270f85e that prevented old hosts.toml files from being cleaned up.

Types of Changes

bugfix

Verification

See linked isse

Testing

Linked Issues

• [Release-1.28] - Custom agent/etc/containerd/certs.d/* files are deleted by k3s on startup #10841

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.62%. Comparing base (bdebbd3) to head (12f664d).
Report is 1 commits behind head on release-1.28.

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.28   #10874      +/-   ##
================================================
- Coverage         40.44%   35.62%   -4.83%     
================================================
  Files               179      162      -17     
  Lines             18567    14269    -4298     
================================================
- Hits               7510     5083    -2427     
+ Misses             9778     8186    -1592     
+ Partials           1279     1000     -279     

Flag	Coverage Δ
e2etests	35.62% <ø> (-9.69%)	⬇️
unittests	?

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