fix: Fix missing throughput in CMCD for HLS live (#3874)

* Use dynamic reference to abrManager

Fixes #3873

Co-authored-by: Dan Sparacio <daniel.sparacio@cbsinteractive.com>

lib/player.js

@@ -2817,11 +2817,10 @@ shaka.Player = class extends shaka.util.FakeEventTarget {
    * @private
    */
   createCmcd_() {
-    const abr = this.abrManager_;
-
     /** @type {shaka.util.CmcdManager.PlayerInterface} */
     const playerInterface = {
-      getBandwidthEstimate: () => abr ? abr.getBandwidthEstimate() : NaN,
+      getBandwidthEstimate: () => this.abrManager_ ?
+        this.abrManager_.getBandwidthEstimate() : NaN,
       getBufferedInfo: () => this.getBufferedInfo(),
       getCurrentTime: () => this.video_ ? this.video_.currentTime : 0,
       getVariantTracks: () => this.getVariantTracks(),