prometheusRules - try going back to exactly how it was before yamllint

...i.e. without a comment before it to suppress yamllint. Maybe
that doesn't work either?

Signed-off-by: Adam Williamson <awilliam@redhat.com>

roles/openshift/project/templates/prometheusRules.yml

@@ -1,4 +1,4 @@
-# jinja2:variable_start_string:'@@',variable_end_string:'@@'
+#jinja2:variable_start_string:'@@',variable_end_string:'@@'
 ---
 apiVersion: monitoring.coreos.com/v1
 kind: PrometheusRule