fix(HLS): Fix resync issues on Safari (#8808)

Removes duplicated logic around timestamp offset checks - now check is
only in `resync()` method. It should stay there, because it ensures it
will be executed only in sequence mode and also avoids otherwise
unnecessary `abort()` call.

Increases threshold to 150 ms as it was the originally proposed value
and gives better experience.

Now timestamp offset change won't be applied in sequence mode if it's
less than 150ms from buffer end, regardless of manifest type.

Author: tykus160

lib/media/media_source_engine.js

@@ -1551,7 +1551,7 @@ shaka.media.MediaSourceEngine = class {
     // Avoid changing timestampOffset when the difference is less than 100 ms
     // from the end of the current buffer.
     const bufferEnd = this.bufferEnd(contentType);
-    if (bufferEnd && Math.abs(bufferEnd - timestampOffset) < 0.1) {
+    if (bufferEnd && Math.abs(bufferEnd - timestampOffset) < 0.15) {
       return;
     }
 
@@ -1807,21 +1807,7 @@ shaka.media.MediaSourceEngine = class {
       timestampOffset += 0.001;
     }
 
-
-    let shouldChangeTimestampOffset = true;
-    if (this.manifestType_ == shaka.media.ManifestParser.HLS) {
-      // Avoid changing timestampOffset when the difference is less than 150 ms
-      // from the end of the current buffer when using sequenceMode
-      const bufferEnd = this.bufferEnd(contentType);
-      if (!bufferEnd || Math.abs(bufferEnd - timestampOffset) > 0.15) {
-        shouldChangeTimestampOffset = true;
-      } else {
-        shouldChangeTimestampOffset = false;
-      }
-    }
-    if (shouldChangeTimestampOffset) {
-      this.sourceBuffers_.get(contentType).timestampOffset = timestampOffset;
-    }
+    this.sourceBuffers_.get(contentType).timestampOffset = timestampOffset;
 
     // Fake an 'updateend' event to resolve the operation.
     this.onUpdateEnd_(contentType);