fix: Fix merging of options for cancelable request

[Koc]

I'm using this CancelableRequest for own needs but it has a bug with merging options. Here an reproducer:

// Create new cancelable get request
const { request, cancel } = CancelableRequest(async function(url, requestOptions) {
    return axios.get(url, requestOptions)
})

const response = await request(generateOcsUrl('apps/forms/api/v2.4/form/{id}', { id }), {params: {tenant}})

the problem is that merging of options merges extra options under options key instead of it merging all keys and values.