[BUGFIX] Add favicon without scheme

Remove the scheme when rendering the link to a favicon in order to
avoid mixed content because the cached header of a page is used for
both HTTP and HTTPS.

Resolves: #69665
Releases: master, 6.2
Change-Id: I39d51bcf31a98369645d144f670e4d6200c2402d
Reviewed-on: https://review.typo3.org/44213


Reviewed-by: Markus Sommer <markussom@posteo.de>
Reviewed-by: Steffen Müller <typo3@t3node.com>
Tested-by: Steffen Müller <typo3@t3node.com>
Reviewed-by: Richard Haeser <richardhaeser@gmail.com>
Tested-by: Richard Haeser <richardhaeser@gmail.com>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Marcus Schwemer <ms@schwemer.de>
Tested-by: Marcus Schwemer <ms@schwemer.de>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>