GoodRunsListSelectorTool.cxx: Do not assign event number to 32-bit integer

Walter Lamplrequested to merge
wlampl/athena:GRL_evtId64 into master

Use auto to get the right data type for event number and time-stamp. The signed 32-bit integer used before is definitely too small.

Note that his change is merely cosmetic, because these values are only used in a DEBUG-print statement.

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