Remove censoring of schema and prefix from debug()

As per discussion in #cakephp the other day, `debug()` will automatically censor out a list of keys, including `prefix` and `schema`. These are useful to see in output for debugging prefix routing, and should not automatically be considered sensitive information.

lib/Cake/Utility/Debugger.php

@@ -455,8 +455,6 @@ protected static function _highlight($str) {
  *  - host
  *  - database
  *  - port
- *  - prefix
- *  - schema
  *
  * This is done to protect database credentials, which could be accidentally
  * shown in an error message if CakePHP is deployed in development mode.
@@ -514,8 +512,6 @@ protected static function _export($var, $depth, $indent) {
  * - host
  * - database
  * - port
- * - prefix
- * - schema
  *
  * @param array $var The array to export.
  * @param int $depth The current depth, used for recursion tracking.
@@ -528,9 +524,7 @@ protected static function _array(array $var, $depth, $indent) {
 			'login' => '*****',
 			'host' => '*****',
 			'database' => '*****',
-			'port' => '*****',
-			'prefix' => '*****',
-			'schema' => '*****'
+			'port' => '*****'
 		);
 		$replace = array_intersect_key($secrets, $var);
 		$var = $replace + $var;