Fix refpix log messages

[melanieclarke]

Fix a small bug stemming from code style fixes. There were a couple malformed log messages in off-nominal refpix use cases.

Tasks

• If you have a specific reviewer in mind, tag them.
• add a build milestone, i.e. Build 12.0 (use the latest build if not sure)
• Does this PR change user-facing code / API? (if not, label with no-changelog-entry-needed)
  • write news fragment(s) in changes/: echo "changed something" > changes/<PR#>.<changetype>.rst (see changelog readme for instructions)
  • update or add relevant tests
  • update relevant docstrings and / or docs/ page
  • start a regression test and include a link to the running job (click here for instructions)
    • Do truth files need to be updated ("okified")?
      • after the reviewer has approved these changes, run okify_regtests to update the truth files
• if a JIRA ticket exists, make sure it is resolved properly

[melanieclarke]

Regtests here: https://github.com/spacetelescope/RegressionTests/actions/runs/15143972155

All passing.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.90%. Comparing base (8478131) to head (3de2d04).
⚠️ Report is 667 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9478   +/-   ##
=======================================
  Coverage   77.90%   77.90%           
=======================================
  Files         362      362           
  Lines       36341    36334    -7     
=======================================
- Hits        28310    28307    -3     
+ Misses       8031     8027    -4     

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