fix: Updated auth header (#62)

## Pull Request Description

Use updated auth header for jellyfin authentication

## Issue Being Fixed

Using deprecated auth headers

Resolves #61 

## Checklist

- [x] If a new package was added, did you ensure it works for all
supported platforms? Is the package also well maintained?
- [x] Did you add localization for any text? If yes, did you sort the
.arb file using ```arb_utils sort <INPUT_FILE>```?
- [x] Check that any changes are related to the issue at hand.

Co-authored-by: PartyDonut <PartyDonut@users.noreply.github.com>

lib/models/credentials_model.dart

@@ -1,9 +1,9 @@
 import 'dart:convert';
 
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:xid/xid.dart';
 
 import 'package:fladder/util/application_info.dart';
-import 'package:xid/xid.dart';
 
 class CredentialsModel {
   final String token;
@@ -27,9 +27,8 @@ class CredentialsModel {
     final application = ref.read(applicationInfoProvider);
     final headers = {
       'content-type': 'application/json',
-      'x-emby-token': token,
-      'x-emby-authorization':
-          'MediaBrowser Client="${application.name}", Device="${application.os}", DeviceId="$deviceId", Version="${application.version}"'
+      'authorization':
+          'MediaBrowser Token="$token", Client="${application.name}", Device="${application.os}", DeviceId="$deviceId", Version="${application.version}"'
     };
     return headers;
   }