twister: qemu: Fix device tests skipped when QEMU not installed

https://github.com/zephyrproject-rtos/zephyr/pull/67595
introduces a bug where if QEMU_BIN_PATH is not set on a Windows
PC, on-device tests are skipped. This fixes that issue.

Signed-off-by: Glenn Andrews <glenn.andrews.42@gmail.com>
1 file changed