refactor(html5): remove confusing references to player in a tech (#3790)

These references to player_ are actually not the player due to techs not having a reference to the player.

src/js/tech/html5.js

@@ -443,11 +443,11 @@ class Html5 extends Tech {
             if (this.el_.duration === Infinity) {
               this.trigger('durationchange');
             }
-            this.off(this.player_, 'timeupdate', checkProgress);
+            this.off('timeupdate', checkProgress);
           }
         };
 
-        this.on(this.player_, 'timeupdate', checkProgress);
+        this.on('timeupdate', checkProgress);
         return NaN;
       }
     }