chore(chart): change cert_manager_enabled to boolean type

Author: lijianguo

charts/controller/values.yaml

@@ -93,5 +93,5 @@ global:
   # This will be the hostname that is used to build endpoints such as "drycc.$HOSTNAME"
   platform_domain: ""
   # Whether cert_manager is enabled to automatically generate controller certificates
-  cert_manager_enabled: "true"
+  cert_manager_enabled: true
   passport_location: "on-cluster"