[BUGFIX] typolink prepends wrong domain when using url scheme

tslib_cObj::typoLink() uses a wrong domain if the target page
has a domain record and a URL scheme, which is different to
current. It prepends a current domain instead of the target
domain of the page.

Change-Id: I1b7f1248f8b62bdaae0adeb114c29f42b146daa4
Resolves: #31771
Releases: 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/6708
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader
Reviewed-by: Markus Klein
Reviewed-by: Dominik Mathern
Tested-by: Dominik Mathern
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter