fix(nextcloud): Drop unused username

packages/nextcloud/lib/src/client.dart

@@ -17,14 +17,12 @@ class NextcloudClient extends DynamiteClient {
   NextcloudClient(
     super.baseURL, {
     this.loginName,
-    this.username,
     final String? password,
     final String? language,
     final AppType appType = AppType.unknown,
     final String? userAgentOverride,
     super.cookieJar,
-  })  : assert(loginName != null || username == null, 'Provide loginName instead of username or both'),
-        super(
+  }) : super(
           baseHeaders: (<String, String?>{
             'OCS-APIRequest': 'true',
             'Accept-Language': language,
@@ -44,9 +42,6 @@ class NextcloudClient extends DynamiteClient {
   /// Identifier used for authentication. This can be the username or email or something else.
   final String? loginName;
 
-  /// Username of the user on the server
-  final String? username;
-
   WebDavClient? _webdav;
   CoreClient? _core;
   NewsClient? _news;

packages/nextcloud/test/helper.dart

@@ -76,7 +76,6 @@ class TestNextcloudClient extends NextcloudClient {
   TestNextcloudClient(
     super.baseURL, {
     super.loginName,
-    super.username,
     super.password,
     super.language,
     super.appType,
@@ -126,7 +125,6 @@ Future<TestNextcloudClient> getTestClient(
   final client = TestNextcloudClient(
     'http://localhost:${container.port}',
     loginName: username,
-    username: username,
     password: clientPassword,
     appType: appType,
     userAgentOverride: userAgentOverride,