Add 'updater.server.url' to Private Variables

Add "updater.server.url" to the privacy redacted values, as it may contain the enterprise key.

Signed-off-by: derschiw <[email protected]>

lib/private/SystemConfig.php

@@ -54,6 +54,7 @@ class SystemConfig {
 		'passwordsalt' => true,
 		'secret' => true,
 		'updater.secret' => true,
+	    'updater.server.url' => true,
 		'trusted_proxies' => true,
 		'preview_imaginary_url' => true,
 		'proxyuserpwd' => true,