twister: Fix suite-name-check bypass on flash error

Fix suite-name-check bypassed at DeviceHandler on flash errors.

If the flash timeout is smaller than needed, but test images are
actually flashed successfully and appropriate tests executed,
then results from the previous test case were taken because
the flash error status makes the suite-name-check bypassed.

Signed-off-by: Dmitrii Golovanov <dmitrii.golovanov@intel.com>