fix ART tags in TrigInDetValidation tests

Merged Tim Adye requested to merge adye/athena:21.3-tid-art5 into 21.3
  • add missing colon in # art-html: tag (test/test_*_art.sh jobs only)
  • Note for reviewers: there's no need to review the scripts in the TrigInDetValidation/test/ directory, as these are autogenerated from a template by the other scripts.

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