Revert "Pass TEST_PLAN_NAME_PREFIX parameter to swarm-testrail-report job"

This reverts commit c5b7e3f0ae34af13cbc2bf762be7ffd2182abcae.

Change-Id: I98b88554dabcc1f2ad37657029719a237171b97e
diff --git a/jobs/pipelines/deploy-cicd-and-run-tests.groovy b/jobs/pipelines/deploy-cicd-and-run-tests.groovy
index 7e26377..ca52a53 100644
--- a/jobs/pipelines/deploy-cicd-and-run-tests.groovy
+++ b/jobs/pipelines/deploy-cicd-and-run-tests.groovy
@@ -97,7 +97,7 @@
         stage("Archive all xml reports") {
             archiveArtifacts artifacts: "**/*.xml,**/*.ini,**/*.log,**/*.tar.gz"
         }
-        if ("${env.REPORT_TO_TESTRAIL}" == "true") {
+        if (env.REPORT_TO_TESTRAIL ?: true) {
             stage("report results to testrail") {
                 shared.swarm_testrail_report(steps)
             }