ExecutionStartToCloseTimeout in SampleExpenseWorkflow is less than StartToCloseTimeout in waitForDecisionActivity

[olegmedvedev]

https://github.com/uber-common/cadence-samples/blob/01bbcade45b9bc30cb3ca6ee128bad41ef5b7b9c/cmd/samples/expense/main.go#L28

https://github.com/uber-common/cadence-samples/blob/01bbcade45b9bc30cb3ca6ee128bad41ef5b7b9c/cmd/samples/expense/workflow.go#L42