Fix up Panasonic DMC-FZ28 crop modes

[kmilos]

Resolves darktable-org/darktable#16457

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.76%. Comparing base (3a250a2) to head (8e066af).
Report is 3 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #694   +/-   ##
========================================
  Coverage    60.76%   60.76%           
========================================
  Files          272      272           
  Lines        16467    16467           
  Branches      2082     2082           
========================================
  Hits         10006    10006           
  Misses        6333     6333           
  Partials       128      128           

Flag	Coverage Δ
benchmarks	11.79% <ø> (ø)
integration	44.84% <ø> (ø)
linux	56.96% <ø> (ø)
macOS	25.10% <ø> (ø)
rpu_u	44.84% <ø> (ø)
unittests	21.49% <ø> (ø)
windows	∅ <ø> (∅)

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[LebedevRI]

@kmilos thank you!
Looks fine to me at a quick glance.