gmultipath tests: Re-enable the failloop test in CI

PR:		258763
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation

tests/sys/geom/class/multipath/failloop.sh

@@ -36,10 +36,6 @@ failloop_head()
 }
 failloop_body()
 {
-	if [ "$(atf_config_get ci false)" = "true" ]; then
-		atf_skip "https://bugs.freebsd.org/258763"
-	fi
-
 	sysctl -n kern.geom.notaste > kern.geom.notaste.txt
 	load_gnop
 	load_gmultipath