[BUGFIX] Remove $scheme from LegacyLinkNotationConverter::resolve()

The code block using $scheme is never reached, because there is already
an elseif condition further above, that is true for all urls containing
":".

The last else block even states in the comment:
"special handling without a scheme"

Therefore the variable is removed to remove a bit of complexity from the
function.

Resolves: #90951
Releases: master, 9.5
Change-Id: I2bc9fe0c546cb946fc32789ee384c3c60ac7c1fa
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64077


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>