fix(xep): Fix discovery of XEP-0191 and XEP-0280

packages/moxxmpp/lib/src/settings.dart

@@ -19,4 +19,7 @@ class ConnectionSettings {
 
   /// The port to connect to. Skips DNS resolution if specified.
   final int? port;
+
+  /// The JID of the server we're connected to.
+  JID get serverJid => JID('', jid.domain, '');
 }

packages/moxxmpp/lib/src/xeps/xep_0191.dart

@@ -37,7 +37,7 @@ class BlockingManager extends XmppManagerBase {
     // Query the server
     final disco = getAttributes().getManagerById<DiscoManager>(discoManager)!;
     _supported = await disco.supportsFeature(
-      getAttributes().getConnectionSettings().jid.toBare(),
+      getAttributes().getConnectionSettings().serverJid,
       blockingXmlns,
     );
     _gotSupported = true;

packages/moxxmpp/lib/src/xeps/xep_0280.dart

@@ -53,7 +53,7 @@ class CarbonsManager extends XmppManagerBase {
     // Query the server
     final disco = getAttributes().getManagerById<DiscoManager>(discoManager)!;
     _supported = await disco.supportsFeature(
-      getAttributes().getConnectionSettings().jid.toBare(),
+      getAttributes().getConnectionSettings().serverJid,
       carbonsXmlns,
     );
     _gotSupported = true;