fix(DASH): Fix segmentSequenceCadence default value (#8877)

According to the latest draft of DASH 6th edition, the default value is
1, not 0.

Author: avelad

lib/dash/dash_parser.js

@@ -2638,7 +2638,7 @@ shaka.dash.DashParser = class {
       numChannels: null,
       audioSamplingRate: null,
       availabilityTimeOffset: 0,
-      segmentSequenceCadence: 0,
+      segmentSequenceCadence: 1,
       encrypted: false,
     });
     getBaseUris = getBaseUris || parent.getBaseUris;