polkit-parsing.sh: use the right service name for polkit

The alias polkitd.service was removed in policykit-1 0.113-5,
so before the release of Bookworm.

In tests, we can see the message:
 Failed to restart polkitd.service: Unit polkitd.service not found.

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

common/polkit-parsing.sh

@@ -14,7 +14,7 @@ cleanup () {
 	rm -f "$TMPFILE"
 
 	# Be nice and leave polkit running as normal.
-	sudo systemctl restart polkitd.service
+	sudo systemctl restart polkit.service
 
 	exit $rv
 }