FIX: bad_by_manual failing in ransac ch pos

[sappelhoff]

PR Description

• follow up to FIX: manually marked bad channels must be excluded in find bads #168

Merge Checklist

• the PR has been reviewed and all comments are resolved
• all CI checks pass
• (if applicable): the PR description includes the phrase closes #<issue-number> to automatically close an issue
• (if applicable): the changes are documented in the changelog changelog.rst
• (if applicable): new contributors have added themselves to the authors list in the CITATION.cff file

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.09%. Comparing base (b203a14) to head (1e249ea).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #173   +/-   ##
=======================================
  Coverage   98.09%   98.09%           
=======================================
  Files           7        7           
  Lines         734      734           
=======================================
  Hits          720      720           
  Misses         14       14           

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