Fixed new "user config" console feature

- Replaced "DI::" call with constructor injection
- Added return value for IPConfig::load() and PreloadPConfig::load()

src/Core/PConfig/IPConfig.php

@@ -35,7 +35,7 @@ interface IPConfig
 	 * @param int $uid The user_id
 	 * @param string $cat The category of the configuration value
 	 *
-	 * @return void
+	 * @return array The loaded config array
 	 * @see Cache
 	 *
 	 */