fixed condition syntax

Author: linoy-zoaretz

.github/workflows/terraform-apply.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: self-hosted
     if: |
       github.event_name == 'issue_comment' &&
-      github.event.issue.pull_request != null &&
+      github.event.issue.pull_request &&
       (contains(github.event.comment.body, '/test') ||
       contains(github.event.comment.body, '/rc_test'))