Revert "blocklistd-helper: Silence another bogus pf warning"

This reverts commit 67ade69eb6.

A fix has been implemented in a943a96a50 ("libpfctl: Fix displaying
deeply nested anchors").

Revert this commit to avoid having differences with upstream.

contrib/blocklist/libexec/blocklistd-helper

@@ -259,7 +259,7 @@ flush)
 		# dynamically determine which anchors exist
 		for anchor in $(/sbin/pfctl -a "$2" -s Anchors 2> /dev/null); do
 			/sbin/pfctl -a "$anchor" -t "port${anchor##*/}" -T flush 2> /dev/null
-			/sbin/pfctl -a "$anchor" -F rules 2> /dev/null
+			/sbin/pfctl -a "$anchor" -F rules
 		done
 		echo OK
 		;;

libexec/blocklistd-helper/blacklistd-helper

@@ -280,7 +280,7 @@ flush)
 		# dynamically determine which anchors exist
 		for anchor in $(/sbin/pfctl -a "$2" -s Anchors 2> /dev/null); do
 			/sbin/pfctl -a "$anchor" -t "port${anchor##*/}" -T flush 2> /dev/null
-			/sbin/pfctl -a "$anchor" -F rules 2> /dev/null
+			/sbin/pfctl -a "$anchor" -F rules
 		done
 		echo OK
 		;;