fix: chat not disconnecting

closes#11

Author: ProgrammingByPermutation

src/TwitchStreamingTools/Services/AccountManager.cs

@@ -96,6 +96,7 @@ public void DeleteCredentials() {
     _twitchClient.TwitchUsername = null;
     CredentialsAreValid = false;
     TwitchUsername = null;
+    Configuration.Instance.WriteConfiguration();
 
     OnCredentialsChanged?.Invoke(null);
     OnCredentialsStatusChanged?.Invoke(false);

src/TwitchStreamingTools/ViewModels/Pages/ChatViewModel.cs

@@ -68,9 +68,9 @@ public ChatViewModel(ITwitchClientProxy twitchClient) {
       Configuration.Instance.WriteConfiguration();
     });
 
-    OnRemoveChat = ReactiveCommand.Create<string>(s => {
-      _selectedTwitchChatNames.Remove(s);
-      // todo: disconnect from chat
+    OnRemoveChat = ReactiveCommand.Create<string>(channel => {
+      _selectedTwitchChatNames.Remove(channel);
+      _twitchClient.RemoveMessageCallback(channel, OnChatMessage);
       Configuration.Instance.TwitchChats = _selectedTwitchChatNames;
       Configuration.Instance.WriteConfiguration();
     });