Fix resolution entity

[tsalo]

Closes none, but addresses a bug identified by Claudia Tarricone in https://neurostars.org/t/issue-with-cbf-quantification-in-multi-delay-pcasl-data-with-aslprep/34031.

Changes proposed in this pull request

• Fix typo in filename patterns where _res-{res} was used instead of _res-{resolution}.
• Also fix corresponding typos for density.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.19%. Comparing base (5fa5312) to head (d8fd6d7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #584   +/-   ##
=======================================
  Coverage   76.19%   76.19%           
=======================================
  Files          38       38           
  Lines        4382     4382           
=======================================
  Hits         3339     3339           
  Misses       1043     1043           

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