Fix latency tracker markOuts

[grainier]

Purpose

$title. Fixes #1771

java.lang.IllegalStateException: MarkIn consecutively called without calling markOut in io.siddhi.SiddhiApps.xxx.Siddhi.Tables.xxx.insert.latency
	at io.siddhi.core.util.statistics.metrics.SiddhiLatencyMetric.markIn(SiddhiLatencyMetric.java:55) 

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[senthuran16]

Thank you @grainier !