Remove module example as it was already in the enabled list by default.

Config/Prosody/etc/conf.avail/example.com.cfg.lua

@@ -26,7 +26,3 @@ VirtualHost "example.com"
 ---Set up an external component (default component port is 5347)
 --Component "gateway.example.com"
 --	component_secret = "password"
-
--- modules_enabled = {
---     "cloud_notify";
--- }