TrigAnalysisTest: Change Trigger configuration in the mc16a test

Rafal Bielskirequested to merge
rbielski/athena:fix-mc16a-test-config into master

Changes in the RDOtoRDOTrigger step running in 21.0-mc16a:

  • change menu version to v6
  • add the run2Config=2016 flag

Discussed in ATR-22237

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