change maps flags from hyphen to underscore in definition files

[elfkuzco]

Changes

• change hypens to underscores in maps offliner definition files. Since the underlying model is DashModel, they would be converted to hyphens while generating the commands for the tasks in zimfarm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.88%. Comparing base (305c871) to head (4c60944).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #120   +/-   ##
=======================================
  Coverage   35.88%   35.88%           
=======================================
  Files          11       11           
  Lines        1045     1045           
  Branches      153      153           
=======================================
  Hits          375      375           
  Misses        654      654           
  Partials       16       16           

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[benoit74]

LGTM, thank you for fixing bad code I've pushed ^^