task_wdt: Kconfig: Increase TASK_WDT_HW_FALLBACK_DELAY range

If a time-intensive task (like coredump storage over logging interface)
is run in the task watchdog callback, the hardware watchdog might
reset the system before the task finishes.

Increasing the delay from 1s to 10s, which should be sufficient for any
use case.

Signed-off-by: Martin Jäger <martin@libre.solar>