PrivateMessageAuthorizationHandler has an error for HasGetPermissionAsync

[zhuang1125]

the source code on File PrivateMessageAuthorizationHandler.cs line 54,
the source is :
return (resource.ToUserId == currentUserId || resource.FromUserId == currentUserId) &&
await _permissionChecker.IsGrantedAsync(context.User,
PrivateMessagingPermissions.PrivateMessages.Delete);

the PrivateMessagingPermissions.PrivateMessages.Delete should be PrivateMessagingPermissions.PrivateMessages.Default

[gdlcf88]

@zhuang1125 - Would you like to fix it with a PR?