fix(CMCD): Do not call play() if CMCD is not enabled (#8149)

Author: avelad

lib/util/cmcd_manager.js

@@ -171,6 +171,10 @@ shaka.util.CmcdManager = class {
    * @param {number} startTimeOfLoad
    */
   setStartTimeOfLoad(startTimeOfLoad) {
+    if (!this.config_ || !this.config_.enabled ||
+        this.config_.version != shaka.util.CmcdManager.Version.VERSION_2) {
+      return;
+    }
     if (this.video_ && this.video_.autoplay) {
       const playResult = this.video_.play();
       if (playResult) {