Properly qualify TrigDecisionTool default tool and service instances

Tim Martinrequested to merge
tamartin/athena:tdt_default_param into master

This lets the TDT operate in Athena (or AthAnalysis) from POOL input without having to explicitly set the TrigConfigSvc (or ConfigTool)

(RAWtoXXX still needs a non-standard setup, but this is built into RecExCommon)

Thanks to @fwinkl for spotting.

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