samples/check-exec: Fix script name

run-script-ask.sh had an incorrect file extension.  This helper script
is not used by kselftests.

Fixes: 2a69962be4a7 ("samples/check-exec: Add an enlighten "inc" interpreter and 28 tests")
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Link: https://lore.kernel.org/r/20250306180559.1289243-1-mic@digikod.net
Signed-off-by: Kees Cook <kees@kernel.org>

diff --git a/samples/check-exec/run-script-ask.inc b/samples/check-exec/run-script-ask.sh
similarity index 100%
rename from samples/check-exec/run-script-ask.inc
rename to samples/check-exec/run-script-ask.sh