Include grilo test in apertis-tests

This was installed but not packaged.

Reviewed-by: Philip Withnall <philip.withnall@collabora.co.uk>
Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D3489

debian/apertis-tests.install

@@ -11,6 +11,7 @@ usr/lib/apertis-tests/cgroups/automated/*.sh
 usr/lib/apertis-tests/clutter
 usr/lib/apertis-tests/common
 usr/lib/apertis-tests/dbus
+usr/lib/apertis-tests/grilo
 usr/lib/apertis-tests/folks
 usr/lib/apertis-tests/inherit-config.sh
 usr/lib/apertis-tests/misc