selftests: Fix failing VXLAN VNI filtering test

iproute2 does not recognize the "group6" and "remote6" keywords. Fix by
using "group" and "remote" instead.

Before:

 # ./test_vxlan_vnifiltering.sh
 [...]
 Tests passed:  25
 Tests failed:   2

After:

 # ./test_vxlan_vnifiltering.sh
 [...]
 Tests passed:  27
 Tests failed:   0

Fixes: 3edf5f66 ("selftests: add new tests for vxlan vnifiltering")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Link: https://lore.kernel.org/r/20230207141819.256689-1-idosch@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/test_vxlan_vnifiltering.sh

@@ -293,19 +293,11 @@ setup-vm() {
 	elif [[ -n $vtype && $vtype == "vnifilterg" ]]; then
 	   # Add per vni group config with 'bridge vni' api
 	   if [ -n "$group" ]; then
-	      if [ "$family" == "v4" ]; then
 		if [ $mcast -eq 1 ]; then
 			bridge -netns hv-$hvid vni add dev $vxlandev vni $tid group $group
 		else
 			bridge -netns hv-$hvid vni add dev $vxlandev vni $tid remote $group
 		fi
-	      else
-		 if [ $mcast -eq 1 ]; then
-		    bridge -netns hv-$hvid vni add dev $vxlandev vni $tid group6 $group
-		 else
-		    bridge -netns hv-$hvid vni add dev $vxlandev vni $tid remote6 $group
-		 fi
-	      fi
 	   fi
 	fi
 	done