UI: Refine YouTube dialog

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- Make the settings a scroll area. This makes it work on smaller screens and
if more items are added in the future, the dialog doesn't get bigger.

- Made the additional settings label bold to distinguish better.
Also removed the colon, as I felt it wasn't needed because it is
now bold.

- Made the margins consistent between the settings and events pages

- Made the scrollbar show only when needed in the events page

- Moved the remember settings checkbox to the top of the settings because
it just seems better to be there.

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