fix: Seek delay for Cast Nest hub (#7423)

Fuchsia devices need more time to seek. 1 second is not enough and 3 look a correct value
related to this
#7424

lib/media/playhead.js

@@ -427,7 +427,9 @@ shaka.media.MediaSourcePlayhead = class {
         // infinite loop on systems where changing currentTime takes a
         // significant amount of time (e.g. Chromecast).
         const time = Date.now() / 1000;
-        if (!this.lastCorrectiveSeek_ || this.lastCorrectiveSeek_ < time - 1) {
+        const seekDelay = shaka.util.Platform.isFuchsiaCastDevice() ? 3 : 1;
+        if (!this.lastCorrectiveSeek_ ||
+            this.lastCorrectiveSeek_ < time - seekDelay) {
           this.lastCorrectiveSeek_ = time;
           canCorrectiveSeek = true;
         }