Pretty up the code text boxes on Install. Affects the non-writable wp-config.php mainly. Code styling taken from Network panel. Props ocean90

git-svn-id: https://develop.svn.wordpress.org/trunk@13870 602fd350-edb4-49c9-b593-d223f7449a82

wp-admin/setup-config.php

@@ -245,7 +245,7 @@ switch($step) {
 ?>
 <p>Sorry, but I can't write the <code>wp-config.php</code> file.</p>
 <p>You can create the <code>wp-config.php</code> manually and paste the following text into it.</p>
-<textarea cols="90" rows="15"><?php
+<textarea cols="98" rows="15" class="code"><?php
 		foreach( $configFile as $line ) {
 			echo htmlentities($line, ENT_COMPAT, 'UTF-8');
 		}