Excluded 2 POJO fields from TSV output

Two of the fields in the POJO have been historically excluded from the TSV (and thus Redshift) on account of the (now fixed) Redshift table width limitation.

This change is the kinesis-enrich equivalent of this line in hadoop-enrich:

https://github.com/snowplow/snowplow/blob/master/3-enrich/scala-hadoop-enrich/src/main/scala/com.snowplowanalytics.snowplow.enrich.hadoop/EtlJob.scala#L177