don't require HLS playback: mp4 for all videos
Similar issues: #263, #464

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Would be nice to be able to get MP4 format for all videos. When you go through the Real™ Twitter API, you can get the MP4 link for any video, not sure if you can through however Nitter is doing the scraping. Example:

* nitter link: https://nitter.net/sahilkapur/status/1527092111195226114
* twitter link: https://twitter.com/sahilkapur/status/1527092111195226114
* direct mp4: https://video.twimg.com/ext_tw_video/1527078073073651712/pu/vid/1280x592/co45-zhhUMy1vBC1.mp4?tag=12

For nitter, you end up with a plethora of `.m3u8` and `.m4s` URLs after HLS playback is enabled. You cannot play any non-GIF videos without HLS playback enabled.