debian: traprain-mock-service: add dep on 'acl'

The traprain-mock-service postinst script uses the 'setfacl' binary
which is provided by the 'acl' package.

Signed-off-by: Guillaume Desmottes <guillaume.desmottes@collabora.co.uk>
Reviewed-by: André Magalhães <andre.magalhaes@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D5282

debian/control

@@ -172,6 +172,7 @@ Depends:
  libtraprain-service-0-0 (= ${binary:Version}),
  ${misc:Depends},
  ${shlibs:Depends},
+ acl,
 Description: Navigation API - mock service
  .
  This package contains a navigation mock service which can be used by