Validator: method validatePattern() check FileUpload and use right name

[h4kuna]

• bug fix? yes issue
• new feature? no
• BC break? no
• doc PR: nette/docs#??? not necessary

Validator accept pattern for FileUpload::getName() instance of FileUplaod::__toString(), where is tmpName.

$form->addUpload('csv')
    ->addRule($form::MIME_TYPE, 'Foo', 'text/*')
    ->addRule($form::PATTERN, 'Message', '.*\.csv');

[dg]

Thanks.