Disabling setting seek property on a delayed sound

Author: pavle-goloskokovic

src/sound/html5/HTML5AudioSound.js

@@ -216,6 +216,9 @@ Object.defineProperty(HTML5AudioSound.prototype, 'seek', {
         }
     },
     set: function (value) {
+        if (this.startTime > 0) {
+            return;
+        }
         if (this.isPlaying || this.isPaused) {
             value = Math.min(Math.max(0, value), this.duration);
             if (this.isPlaying) {