Revert "Move execution of gatling test to 17:15 UTC"

This reverts commit 1e2083d4436e489e5432d62033b3fd759b0ea483.

Reason for revert: "No reason to have moved this to 17:15 UTC, the job
can successfully run at midnight"

Change-Id: I8e219980553aa72a3331000a3d8aa65a931cd4c3
diff --git a/jenkins/gatlingTestPipeline.yaml b/jenkins/gatlingTestPipeline.yaml
index c576b82..21fd1de 100644
--- a/jenkins/gatlingTestPipeline.yaml
+++ b/jenkins/gatlingTestPipeline.yaml
@@ -9,4 +9,4 @@
             - master
     dsl: !include-raw: gatlingTestPipeline.groovy
     triggers:
-      - timed: 'H/15 17 * * *'
+      - timed: "@midnight"