lib/remote: Fix ‘Since’ line for OstreeRemote
lib/remote: Fix ‘Since’ line for OstreeRemote

There was a typo in it when it was first introduced. Let’s not live in
the past.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Closes: #950
Approved by: cgwalters

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