Don't append port to Host when using HTTPS

[salty-horse]

Tested using 0.15.1, but I think it's relevant to master.

When --output-http points to HTTPS, Gor appends the ":443" port to the Host header.
This is unexpected. I can't find a reference in any standards, but browsers and various command line tools don't send it, and web servers don't expect it.

For example, here's curl's exception for HTTP and HTTPS: https://github.com/curl/curl/blob/0649433/lib/http.c#L2024

This condition in http_client.go line 64 should also check for "https":

if u.Scheme != "http" {
    u.Host += ":" + defaultPorts[u.Scheme]
}

[buger]

Should be fixed in master, thank you for the report!