fix(kafka scaler):activationLagThreshold
supports 0 as valid value
#4143
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KEDA is supporting 0 as the default value for activationLagThreshold in kafka scaler. But if we set this field explicitly with the 0 value, KEDA is throwing below error:
"error":"error parsing kafka metadata: "activationLagThreshold" must be positive number"
A default should always behave the same whether you set it explicitly or leave it, if optional.
Fixed the code to accept 0 in the configuration param.
Fixes #4137