tf-gerrit-tforg-l2: fix gerrit trigger structure

The review of this job failed the automated sanity check at:

https://review.trustedfirmware.org/c/ci/tf-a-job-configs/+/6384

Fix the trigger to match the documented structure of gerrit triggers at:

https://docs.openstack.org/infra/jenkins-job-builder/triggers.html?highlight=gerrit#triggers.gerrit

So the job can actually be deployed on the server.

Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
Change-Id: I501126caacb40ee1b8c35eb20dbd538551c733dd
diff --git a/tf-gerrit-tforg-l2.yaml b/tf-gerrit-tforg-l2.yaml
index 6f05af7..b7ed925 100644
--- a/tf-gerrit-tforg-l2.yaml
+++ b/tf-gerrit-tforg-l2.yaml
@@ -129,18 +129,18 @@
     triggers:
     - gerrit:
         server-name: review.trustedfirmware.org
-        projects:
-        - branches:
-          - branch-compare-type: PLAIN
-            branch-pattern: integration
-          project-compare-type: PLAIN
-          project-pattern: TF-A/trusted-firmware-a
         trigger-on:
           - comment-added-event:
               approval-category: "Allow-CI"
               approval-value: 2
-          override-votes: true
-          gerrit-build-successful-verified-value: 1
-          gerrit-build-failed-verified-value: -1
-          gerrit-build-unstable-verified-value: -1
-            approval-value: 1
+        projects:
+          - project-compare-type: PLAIN
+            project-pattern: TF-A/trusted-firmware-a
+            branches:
+              - branch-compare-type: PLAIN
+                branch-pattern: integration
+        override-votes: true
+        gerrit-build-successful-verified-value: 1
+        gerrit-build-failed-verified-value: -1
+        gerrit-build-unstable-verified-value: -1
+        approval-value: 1