[ticket/14381] Set the mode in message parser to "reparse"

The default mode is "post". By setting it to something else,
all limits pertaining to posts (min/max length, etc...) should
be disabled.

PHPBB3-14381

phpBB/phpbb/textreparser/base.php

@@ -230,7 +230,8 @@ abstract class base implements reparser_interface
 			$unparsed['enable_img_bbcode'],
 			$unparsed['enable_flash_bbcode'],
 			$unparsed['enable_quote_bbcode'],
-			$unparsed['enable_url_bbcode']
+			$unparsed['enable_url_bbcode'],
+			'reparse'
 		);
 
 		// Save the new text if it has changed and it's not a dry run