out_cloudwatch_logs: set 1 worker as default

[PettitWesley]

Signed-off-by: Wesley Pettit wppttt@amazon.com

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[PettitWesley]

@edsiper Simple change. Please merge. I did default workers for all the other plugins earlier, but left out cloudwatch_logs since at the time we thought we had a bug in it when workers were enabled, but then that turned out be incorrect.