[Restore function] Make "copy link" button create full link with http/https in front

[themerekat]

When you click the "download link" button from a search, it doesn't append "https://" to the beginning of the link, which makes copying and pasting the link slightly less convenient (it doesn't always automatically create a link in word processors and emails).

Example:
cch2.org/portal/collections/list.php?db=123&comingFrom=newsearch

[egbot]

Another dev request is reducing the size of the copied link, which makes it easier to share. The code within 3.1 Master branch removes all empty variables plus the db variable if "all" is listed (e.g. db=all%2C5%2C70%2C99), which is equivalent to it being empty. However, it seems like this functionality has been removed from the current Dev branch. The code in the master branch also converts the %2C to commas, which don't need to be encoded. Commas also don't need to be encoded to %2C in the url, or the search form could be converted to a POST method so that the URL is not displayed, which is what the old form did and why the copy link button was add.