There is "extensions.partialclone" and "core.partialCloneFilter", but
not "core.partialclone". Only "extensions.partialclone" is meant to
contain a remote name.
While at it, let's wrap the relevant code lines to keep them at a
reasonable length.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>