repo: Fix the skip-summary-if-summary.sig-is-same cache
repo: Fix the skip-summary-if-summary.sig-is-same cache

This code was always downloading the summary even for a cache hit due
to a missing else.

GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree