debian: Enable location-download.timer after installation

This timer periodly executes the location-downloader and keeps
the location database up to date.

Fixes #12412.
Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

debian/rules

@@ -14,3 +14,6 @@ override_dh_auto_configure:
 
 override_dh_perl:
 	dh_perl -d
+
+override_dh_systemd_enable:
+	dh_systemd_enable location-downloader.timer