ctrl_alt_chords_without_typed_text_still_run sent Ctrl+L and Ctrl+Alt+L
as egui reports them off the Mac (ctrl and command held). Since #3119
the keymap reads a Mac's Ctrl as a key of its own, so on macOS the test
pressed Cmd+Ctrl+L, which has no binding, and failed with
("Hi", 1) != ("Hi", 2).
The test now holds the command key egui reports on the platform the
keymap follows: Cmd on a Mac, Ctrl elsewhere. Off the Mac it sends the
same events as before.