Added a fetch on hidden items to fix Trakt.tv API issue

[Anrolosia]

Trakt.tv API documentation states: By default, any hidden seasons will be removed from the response and stats. To include these and adjust the completion stats, set the hidden flag to true. Like you can see here: https://github.com/dylandoamaral/trakt-integration/blob/main/custom_components/trakt_tv/apis/trakt.py#L108 we're not specifying any value for that field, that means hidden seasons shouldn't be retrieved. But sadly it's the case. I'm fixing that by fetching user's hidden items first

[dylandoamaral]

Hi thank you for your support! Can you add a comment in the code about this trakt bug specificity ?

Otherwise we will surely forget why we did that ^^'

[Anrolosia]

@dylandoamaral Done :)