Make Admin::HealthCheckController EE-compatible

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

app/controllers/admin/health_check_controller.rb

@@ -2,6 +2,12 @@
 
 class Admin::HealthCheckController < Admin::ApplicationController
   def show
-    @errors = HealthCheck::Utils.process_checks(['standard'])
+    @errors = HealthCheck::Utils.process_checks(checks)
+  end
+
+  private
+
+  def checks
+    ['standard']
   end
 end