selftests/nolibc: remove outdated comment about construct order

The constructor order is not (and should not) be tested. Remove the
comment.

Fixes: a782d45c ("selftests/nolibc: stop testing constructor order")
Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Link: https://lore.kernel.org/r/20250731201225.323254-3-benjamin@sipsolutions.net


Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>