UI: Set default recording format to Fragmented MOV on macOS

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In 22205d582c, the change to default to
Fragmented MP4/MOV on all platforms was reverted due to compatibility
issues with the default video player on Windows.
On macOS however, the default player (QuickTime Player) works fine with
fragmented formats, and instead is unable to play MKV files (which have
always been the default format for OBS). This change makes videos with
the default settings playable on macOS with the default player.

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