Allow cloning XML-based modules from command line.

kdesrc-build prefers module names fed in from the command line
(obviously ;), but if the module didn't already exist on disk then the
only source of info about the module is probably encoded in the rc file,
but the modules read from the rc file were ignored.

This change simply copies over the more accurate rc-file-based modules
that have matching names, without this change you'd get modules that
tried to git-clone themselves from "kde-projects" instead of
git://anongit.kde.org/foo.git since the pass the alters repository
settings only runs on modules that are supposed to be based off of
projects.kde.org.