Username used in place of password in IBM MQ scaler

[tdolby-at-uk-ibm-com]

It looks like the username variable "val" is used instead of the password variable "value" in the IBM MQ scaler, which makes authentication fail in many (most?) cases.

keda/pkg/scalers/ibmmq_scaler.go

Line 140 in a84c5cc

meta.password = val

passwordFromEnv would work as expected.

[tdolby-at-uk-ibm-com]

Verified using netcat to dump the actual REST request made by the scaler; can submit a PR if needed.

[tomkerkhove]

That would be awesome, thank you!