remove () from postgres port value

* awx task container uses postgres port to wait for postgres to become
available before the container init continues. The () are problematic
and are removed.
* () was originally added to fix an openshift issues. That error does
NOT occur with this fix.

installer/openshift/templates/deployment.yml.j2

@@ -33,7 +33,7 @@ spec:
             - name: DATABASE_HOST
               value: {{ pg_hostname|default('postgresql') }}
             - name: DATABASE_PORT
-              value: ({{ pg_port|default('5432') }})
+              value: {{ pg_port|default(5432) }}
             - name: DATABASE_PASSWORD
               value: {{ pg_password }}
             - name: MEMCACHED_HOST