Using NewApiWithClient uses HTTP even when HTTPS requested

[rossjones]

When using NewApiWithClient and providing a multiaddress, it results in a HTTP request, even if the multiaddress specifies HTTPS.

For example,

api, _ := NewApiWithClient(ma.NewMultiaddr("/dns4/example.com/tcp/443/https"), &http.Client{})
api.url == "example.com:80"

# in request.go we find 
if !strings.HasPrefix(url, "http") {
    url = "http://" + url
}

NewApiWithClient should return a HttpApi whose url contains the url protocol (http or https).

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