fix(SUP-39574): Enable captions button is not working (#725)

the issue:
when the textLanguage config is defined to "auto" and there is no previous language in the localSession when clicking on enable caption button nothing happen.

root cause:
trying to find track with "auto" language and not real language

the solution:
when "captionsDisplay" is disabled change the attribute state to defaultLanguage (the playbackConfig.textLanguage after set the language for "auto")

src/player.js

@@ -2611,7 +2611,7 @@ export default class Player extends FakeEventTarget {
       this._playbackAttributesState.audioLanguage ||
       this._getLanguage<AudioTrack>(this._getAudioTracks(), playbackConfig.audioLanguage, activeTracks.audio);
     if (!playbackConfig.captionsDisplay) {
-      this._playbackAttributesState.textLanguage = playbackConfig.textLanguage;
+      this._playbackAttributesState.textLanguage = defaultLanguage;
       this._setDefaultTrack<TextTrack>(this._getTextTracks(), OFF, offTextTrack);
     } else {
       if (currentOrConfiguredTextLang === playbackConfig.textLanguage) {