changed roundcube theme to 'larry' (#1138)

Updated the setup file to use roundcube's 'larry' theme as the default.

setup/webmail.sh

@@ -121,7 +121,7 @@ cat > $RCM_CONFIG <<EOF;
 \$config['product_name'] = '$PRIMARY_HOSTNAME Webmail';
 \$config['des_key'] = '$SECRET_KEY';
 \$config['plugins'] = array('html5_notifier', 'archive', 'zipdownload', 'password', 'managesieve', 'jqueryui', 'vacation_sieve', 'persistent_login', 'carddav');
-\$config['skin'] = 'classic';
+\$config['skin'] = 'larry';
 \$config['login_autocomplete'] = 2;
 \$config['password_charset'] = 'UTF-8';
 \$config['junk_mbox'] = 'Spam';