twister: reenable build samples on Windows OS

Fix few limitation which do not allow to run Twister on Windows OS.
Especially turn off "import pty" module, due to the fact, that this
module can be used only on POSIX OS.

Fixes #40007

Signed-off-by: Piotr Golyzniak <piotr.golyzniak@nordicsemi.no>
2 files changed