[NO ISSUE] Fix generation of boolean literals

Change-Id: If96bbfbeb1f0be3bdf70d04dc0bed4da85299d9f
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb-clients/+/15383
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Dmitry Lychagin <dmitry.lychagin@couchbase.com>
Reviewed-by: Ian Maxon <imaxon@uci.edu>