[rest] fix: rename of Dataset to ActiveDataset in otbr open-api.yaml

[harterSe]

There was an link to an not existing component which resulted in an error when generating an open api client.

The error was in the Route

/node/dataset/active(get)

The missing component was:
$ref: "#/components/schemas/Dataset"

I changed the route to use the existing component:
$ref: "#/components/schemas/ActiveDataset"

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[wgtdkp]

Thanks for the fix!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.42%. Comparing base (2b41187) to head (56233d5).
Report is 841 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2557       +/-   ##
===========================================
- Coverage   55.77%   45.42%   -10.36%     
===========================================
  Files          87      102       +15     
  Lines        6890    12222     +5332     
  Branches        0      895      +895     
===========================================
+ Hits         3843     5552     +1709     
- Misses       3047     6368     +3321     
- Partials        0      302      +302     

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[jwhui]

Thanks! 👍🏼