[ticket/10876] Revert "add newline after php tag"-regex back to 3.0 version

The old regex just results in some additional new lines in the output.
So this is only beautifying and considered unworthy in respect to the dying
php servers we observed on windows.

PHPBB3-10876

phpBB/includes/template/filter.php

@@ -209,7 +209,7 @@ class phpbb_template_filter extends php_user_filter
 
 		*/
 
-		$data = preg_replace('~(?<!^)(<\?php(?:(?<!\?>).)+(?<!/\*\*/)\?>)$~m', "$1\n", $data);
+		$data = preg_replace('#\?\>([\r\n])#', '?>\1\1', $data);
 		$data = str_replace('/**/?>', "?>\n", $data);
 		$data = str_replace('?><?php', '', $data);
 		return $data;