fix(HLS): don't do sequence mode workaround unless there's a text stream #5079
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The VTT cue timing fix in #4217 seems to have caused a regression for videos without VTT streams, where the first segment would sometimes not play smoothly. It also appears to fix the gap jumping seen in the "Art of Motion (HLS, TS)" demo. This was partially fixed for fMP4 in #4553 but didn't fix the issue for MPEG-2 TS.
Fixes #4975.