fix(play-toggle): missing svg play icon (#8337)

Svg play icon is missing when player is initialized with class `vjs-has-started`.

- add `setIcon` to the `play-toggle` component constructor

Fixes #8336

src/js/control-bar/play-toggle.js

@@ -27,6 +27,8 @@ class PlayToggle extends Button {
     // show or hide replay icon
     options.replay = options.replay === undefined || options.replay;
 
+    this.setIcon('play');
+
     this.on(player, 'play', (e) => this.handlePlay(e));
     this.on(player, 'pause', (e) => this.handlePause(e));