tests/if_lagg_test: unskip 'witness' testcase

This testcase passes consistently (in 100+ runs) now.

Signed-off-by:	Siva Mahadevan <[email protected]>
PR:		244163, 251726
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation

tests/sys/net/if_lagg_test.sh

@@ -392,9 +392,6 @@ witness_head()
 }
 witness_body()
 {
-	if [ "$(atf_config_get ci false)" = "true" ]; then
-		atf_skip "https://bugs.freebsd.org/244163 and https://bugs.freebsd.org/251726"
-	fi
 	if [ `sysctl -n debug.witness.watch` -ne 1 ]; then
 		atf_skip "witness(4) is not enabled"
 	fi