application/json content type is not set for body that only has one field

this is one of our endpoints with a body that may accept two fields:
```ts
/**
* No description
*
* @tags Custodians
* @name PostSecuredCustodiansCreate
* @request POST:/v1/secured/custodians/create
*/
postSecuredCustodiansCreate = (
body: {
name: string;
notes?: string;
},
params: RequestParams = {}
) =>
this.request<
{
status: 'ok';
data: {
id: string;
/** @format date-time */
createdAt: string;
/** @format date-time */
updatedAt: string;
name: string;
notes?: string;
};
},
any
>({
path: `/v1/secured/custodians/create`,
method: 'POST',
body: body,
type: ContentType.Json,
format: 'json',
...params,
});
```

and in the same file, any endpoint that requires one field has missing `type` in request options:

```ts
/**
* No description
*
* @tags Custodians
* @name PostSecuredCustodiansGet
* @request POST:/v1/secured/custodians/get
*/
postSecuredCustodiansGet = (
body: {
id: string;
},
params: RequestParams = {}
) =>
this.request<
{
status: 'ok';
data: {
id: string;
/** @format date-time */
createdAt: string;
/** @format date-time */
updatedAt: string;
name: string;
notes?: string;
};
},
any
>({
path: `/v1/secured/custodians/get`,
method: 'POST',
body: body,
format: 'json',
...params,
}); // `type` arg is missing from here, client tries to send the body as text
```