Fix DAST rules to only run for nightly schedule in canonical project

Signed-off-by: Rémy Coutable <remy@rymai.me>

.gitlab/ci/rules.gitlab-ci.yml

@@ -1289,7 +1289,7 @@
   rules:
     - if: '$DAST_DISABLED || $GITLAB_FEATURES !~ /\bdast\b/'
       when: never
-    - <<: *if-default-branch-schedule-nightly
+    - <<: *if-dot-com-ee-nightly-schedule
       allow_failure: true
 
 .reports:rules:package_hunter-yarn: