fix(FEC-11708): reset cast initiator on disconnect (#72)

We set isCastInitiator=true on cast button click, and set it to false if the cast request didn't succeed or the cast menu lost focus.

However, if player A is already casting, when we click on the button in player B, we set isCastInitiator=true but we have no event to indicate that the cast request did not succeed, since a cast request can't be made at all while player A is casting, and so for player B isCastinitiator is not set to false.

When having 3+ players this can cause a situation where multiple players will have isCastInitiator set to true when a player starts casting, which will cause them all to connect to the same remote session.

To prevent this, we need to reset isCastInitiator for ALL players on disconnect.

Fixes FEC-11708.

src/cast-player.js

@@ -960,9 +960,9 @@ class CastPlayer extends BaseRemotePlayer {
       }
     } else {
       // savedEntryId === localEntryId if this player's cast session was stopped by the user
+      this._isCastInitiator = false;
       const savedEntryId = this._getSessionEntryId(this._castSession);
       if (savedEntryId && savedEntryId === localEntryId) {
-        this._isCastInitiator = false;
         this._setupLocalPlayer();
       }
     }