Unexpected results when using "PHPBB_USE_BOARD_URL_PATH"

When "PHPBB_USE_BOARD_URL_PATH" is defined as true so the web paths are all absolute, the link to the stylesheet will still not be an absolute link due to the user style storing the theme in the database.

Fix is to change the $phpbb_root_path used in the T_STYLESHEET_LINK tempalte variable to $web_path.