Design of shoutbox adjust

styles/onelineblue/style.css:
- added style-tag to the shoutbox-table so the hole text is displayed on one line
Adjust Shoutbox

inc/boxarea.php:
- give shoutbox table data an id --> username_shoutbox

styles/onelineblue/style.css:
- set the nowrap only for username in the shoutbox. Text can be wrapped