Subsite ID added to external https links in CMS preview

[sig-peggy]

In LeftAndMain_Subsites.js the function to inject the Subsite ID into internal links only checks for http:// to identify external links, so it's appending ?SubsiteID=n to all https:// links as well.

[michalkleiner]

Good find. Also, it would seem like an insufficient check if it doesn't take into account the CMS domain/host at all.