flvmux: Don't reset muxer state on flush
Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-good/-/merge_requests/806
Only reset pad states. We might want to pick up muxing at the same timestamp.
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Copied from https://gitlab.freedesktop.org//gstreamer/gst-plugins-good/-/merge_requests/806
Only reset pad states. We might want to pick up muxing at the same timestamp.