MediaCategoryViewController: Remove unnecessary layout update

Soomin Leerequested to merge
bubu/vlc-ios:newui/edit/transition/fix/01 into master

This could lead to potential crash since editCollectionViewLayout isn't set yet.

Additionally, it will get updated once the layout will be set.

This will probably fix https://appcenter.ms/orgs/videolan/apps/VLC-for-iOS-production/crashes/errors/3350845194u/overview.

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