avformat/mpegts: unset DTS/PTS for subtitle PES packets if PCR not available
Fixes issues when a subtitle packet is received before PCR for the program has been received, leading to wildly jumping timestamps on the lavf client side as well as in the re-ordering logic. This usually happens in case of multiplexes where the PCR of a program is not taken into account with subtitle tracks' DTS/PTS.
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