[ticket/11613] Cookies do not work for netbios domain

[PHPBB3-11613](https://tracker.phpbb.com/browse/PHPBB3-11613)
```
FILE: /home/travis/build/phpbb/phpbb/phpBB/phpbb/session.php
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FOUND 1 ERROR(S) AFFECTING 1 LINE(S)
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1056 | ERROR | TRUE, FALSE and NULL must be lowercase; expected "false" but
| | found "FALSE" (Generic.PHP.LowerCaseConstant.Found)
--------------------------------------------------------------------------------
```