debian: add dep on dbus to libtraprain-0-tests

The tests are using 'dbus-daemon' to spawn a bus. This binary is
part of the dbus package.

Signed-off-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Reviewed-by: Héctor Orón Martínez <hector.oron@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D4303

debian/control

@@ -185,6 +185,7 @@ Depends:
  libtraprain-service-0-0 (= ${binary:Version}),
  libtraprain-client-0-0 (= ${binary:Version}),
  traprain-mock-service,
+ dbus,
  ${misc:Depends},
  ${shlibs:Depends},
 Description: Navigation API - tests