MWEB-1059 Wikia branding on a single map page

If you remove `private` properties from the beginning of the file you'll be able to change it to one line:
```php
$this->setVal( 'mapId', (int) $this->getPar() );
```
and then in following lines: `120`, `128` thanks to Nirvana magic (`WikiaDispatchableObject`) the value from response will be taken. Although, it's less explicit and I'd like @hakubo and @aquilax share their thoughts about it :japanese_ogre: