Correctly disable ntp install for onprem

Summary:
D8085 incorrectly wrapped the when conditional for disabling onprem. Fixedd it so the braces
completely encompass the conditional.

Test Plan: onprem install - make sure it doens't have ntp

Reviewers: ram, bogdan, alan

Reviewed By: alan

Subscribers: jenkins-bot, yugaware

Differential Revision: https://phabricator.dev.yugabyte.com/D8110

managed/devops/roles/provision-cluster-server/tasks/main.yml

@@ -38,7 +38,7 @@
       name: ntp
       state: restarted
     when: ansible_distribution == "Ubuntu"
-  when: not should_setup_chrony and not air_gap and "{{ cloud_type != 'onprem' }}"
+  when: "{{ not should_setup_chrony and not air_gap and cloud_type != 'onprem' }}"
 
 - block:
   - name: Uninstall NTP if available