UI: Fix preprocessor directives for platform integrations

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The macros `YOUTUBE_ENABLED`, `RESTREAM_ENABLED`, and `TWITCH_ENABLED`
are not defined when the associated features are not enabled.
When the code was originally implemented, there were definitions to set
`0` if the feature is disabled. However a later commit 349372b removes
the definition. Now, the use of `#ifdef` is better than just `#if`.

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