Fix codify rel path

[darcymason]

For #1865

Tasks

• Unit tests added that reproduce the issue or prove feature is working
• Fix or feature added
• Code typed and mypy shows no errors
• Documentation updated (if relevant)
  • No warnings during build
  • Preview link (CircleCI -> Artifacts -> doc/_build/html/index.html)
• Unit tests passing and overall coverage the same or better

[codecov]

Codecov Report

Merging #1867 (f0934ef) into main (34c68f9) will decrease coverage by 0.01%.
Report is 3 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1867      +/-   ##
==========================================
- Coverage   97.58%   97.57%   -0.01%     
==========================================
  Files          64       63       -1     
  Lines       10760    10741      -19     
==========================================
- Hits        10500    10481      -19     
  Misses        260      260              

Files Changed	Coverage Δ
src/pydicom/dataelem.py	98.38% <ø> (-0.02%)	⬇️
src/pydicom/pixel_data_handlers/rle_handler.py	100.00% <ø> (ø)
src/pydicom/cli/main.py	95.55% <100.00%> (+0.10%)	⬆️

... and 2 files with indirect coverage changes

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