autotests: Add laptop test cases in OutputChangesTest::testGenerateConfigs()
The scale factor is chosen based on the device type, however the test omits this part completely.
This change makes the test register a lid switch device in order to simulate generating an output config on a laptop device, e.g. a regular laptop or Steam Deck.
(cherry picked from commit d1c018c0)
Co-authored-by: Vlad Zahorodnii vlad.zahorodnii@kde.org