fix snippet syntax for logger

vim/snippets/php.snippets

@@ -4,4 +4,4 @@ snippet ppre
 snippet vardump
 	var_dump($${1:check_variable}); exit;
 snippet logger
-	Logger::debug('${1:description} ' . print_r($${2:variable}, true);
+	Logger::debug('${1:description} ' . print_r($${2:variable}, true));