obs-ffmpeg: Fix ffmpeg_output memory leak

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The memory leak was introduced by a commit ba68eda59 to use
av_packet_alloc because av_init_packet got deprecated.

Also removes a boolean flag `new_packet` and use the pointer `packet`,
which is introduced by ba68eda59, to indicate there is a new packet.

Co-authored-by: Norihiro Kamae <norihiro@nagater.net>

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