autotests: Adjust testXkb to correct Hyper key mappings
By default, hyper keys are interpreted as meta keys. However, due to a Qt bug, it had been incorrectly mapped.
Commit b45b9090c3b66d541f57f8d049c22247f8c115ca in qtbase repo fixed it, so the test needs adjustments.
Draft: d_ed suggested putting a runtime check, but I'm not sure how it can be done