Summary

YT depreciated something on their endpoint, the embed needs to use controls=1, and controls=2 shows a black preview.

Steps to test

1. Open a comment
2. Post a youtube link
3. After posting, make sure the video has a preview and is not a black box with a play button.

Estimated Regression Scope

Not huge regression scope, worst case something goes wrong with youtube embeds.

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merged

mentioned in commit 9764b044