Refs #8259, remove Zend_Validate_EmailAddress entry from global.php since we...

Refs #8259, remove Zend_Validate_EmailAddress entry from global.php since we don't need to specify custom constructor parameters. php-di will just default to default construction.

config/global.php

@@ -66,5 +66,4 @@ return array(
 
     'Piwik\EventDispatcher' => DI\object()->constructorParameter('observers', DI\get('observers.global')),
 
-    'Zend_Validate_EmailAddress' => DI\object('Zend_Validate_EmailAddress'),
 );