Vt102EmulationTest: Use QTEST_GUILESS_MAIN
Summary: Allowing the test to pass without a running X server.
Test Plan: Test still passes
Reviewers: Konsole, hindenburg
Reviewed By: Konsole, hindenburg
Subscribers: hindenburg, konsole-devel
Tags: Konsole
Differential Revision: https://phabricator.kde.org/D14539