tests/fibs_test: unskip udp_dontroute6 testcase

This test now consistently passes (300+ consecutive runs).

Signed-off-by:	Siva Mahadevan <[email protected]>
PR:		244172
Sponsored by:	The FreeBSD Foundation

tests/sys/netinet/fibs_test.sh

@@ -663,9 +663,6 @@ udp_dontroute6_head()
 
 udp_dontroute6_body()
 {
-	if [ "$(atf_config_get ci false)" = "true" ]; then
-		atf_skip "https://bugs.freebsd.org/244172"
-	fi
 	# Configure the TAP interface to use an RFC3849 nonrouteable address
 	# and a non-default fib
 	ADDR0="2001:db8::2"