[ticket/12458] Apply Squiz.WhiteSpace.SuperfluousWhitespace.* to legacy code.

* There MUST NOT be trailing whitespace at the end of lines.
* There MUST NOT be whitespace before the first content of a file.
* There MUST NOT be whitespace after the last content of a file.
* Functions MUST NOT contain multiple empty lines in a row.

PHPBB3-12458

phpBB/includes/mcp/mcp_ban.php

@@ -171,7 +171,7 @@ class mcp_ban
 				case 'user':
 					$pre_fill = (string) $db->sql_fetchfield('username');
 				break;
-				
+
 				case 'ip':
 					$pre_fill = (string) $db->sql_fetchfield('user_ip');
 				break;