Use short form array syntax everywhere

- Add short form array syntax to po2php.php generation

src/Worker/RemoveContact.php

@@ -14,12 +14,12 @@ class RemoveContact {
 	public static function execute($id) {
 
 		// Only delete if the contact doesn't exist (anymore)
-		$r = dba::exists('contact', array('id' => $id));
+		$r = dba::exists('contact', ['id' => $id]);
 		if ($r) {
 			return;
 		}
 
 		// Now we delete all the depending table entries
-		dba::delete('contact', array('id' => $id));
+		dba::delete('contact', ['id' => $id]);
 	}
 }