This fixes a regression introduced with commit a09c7da ("tests: Fork and exec
a new Guile for the marionette REPL.") and only partially fixed with the
follow-up commit f518882 (" tests: Add missing module imports for
marionette-evaluated code.").
* gnu/tests/telephony.scm (run-jami-test): Remove extraneous module imports.
Move the setting of the DBUS_SESSION_BUS_ADDRESS environment variable inside
the first marionette-eval'd setup test.
["service can be stopped"]: Add missing (gnu build dbus-service) module.