Duplicate client_id key in auth_config_multiple_account.json

The configuration file at `app/src/main/res/raw/auth_config_multiple_account.json` contains two client_id fields. Example:

```
{
"client_id" : "Enter_the_Application_Id_Here",
"client_id" : "",
"authorization_user_agent" : "WEBVIEW",
"redirect_uri" : "",
"account_mode" : "MULTIPLE",
"broker_redirect_uri_registered": true,
"authorities" : [
{
"type": "AAD",
"authority_url": "https://login.microsoftonline.com/common"
}
]
}
```

Should the first one perhaps be `application_id` or another key? Just wanted to confirm the intended field name.

Open app/src/main/res/raw/auth_config_multiple_account.json and verify the expected schema for multiple-account authentication configuration. Confirm which key should replace the duplicate client_id, then ensure the file contains one valid client identifier field and remains valid JSON.

Written by the indexing model from the issue text.