authorized_keys: Fix option syntax

> `bad key options: missing start quote`

dch-autoprovision.spec

@@ -60,7 +60,7 @@ mkdir -p "${RPM_BUILD_ROOT}%{_presetdir}"
 
 %posttrans
 if [ $1 -eq 1 ]; then
-    printf 'expiry-time=%s,restrict,pty %s\n' \
+    printf 'expiry-time="%s",restrict,pty %s\n' \
         "$(date -d +1hour +%Y%m%d%H%M)" \
         "$(cat %{dch_datadir}/host-provisioner.key)" \
         >> /root/.ssh/authorized_keys