fix(DASH): Live DASH allows segment overlap in the updated manifest for first new segments (#7405)

fix(DASH): Live DASH allows segment overlap in the updated manifest for
first new segments to avoid creating GAP with ms inaccurate manifest vs
Segment duration and start time

Fixes #7397

Author: Iragne

lib/dash/segment_template.js

@@ -860,7 +860,7 @@ shaka.dash.TimelineSegmentIndex = class extends shaka.media.SegmentIndex {
       if (currentTimeline.length) {
         const lastCurrentEntry = currentTimeline[currentTimeline.length - 1];
         newEntries = info.timeline.filter((entry) => {
-          return entry.start >= lastCurrentEntry.end;
+          return entry.end > lastCurrentEntry.end;
         });
       } else {
         newEntries = info.timeline.slice();