Fix IPv6 ULA addresses excluded from local address set

The filter condition `IsGlobalUnicast() && !IsPrivate()` incorrectly
excluded ULA addresses (fc00::/7) from inet6_local_address_set,
causing DNS hijack to fail for IPv6 ULA addresses.

Fixes: sagernet/sing-box#3698

redirect_nftables_rules.go

@@ -103,10 +103,6 @@ func (r *autoRedirect) nftablesCreateLocalAddressSets(
 				update = true
 			}
 		}
-		localAddresses6 = common.Filter(localAddresses6, func(it netip.Prefix) bool {
-			address := it.Addr()
-			return address.IsLoopback() || address.IsGlobalUnicast() && !address.IsPrivate()
-		})
 		if len(lastAddresses) == 0 || update {
 			_, err := nftablesCreateIPSet(nft, table, 6, "inet6_local_address_set", nftables.TableFamilyIPv6, nil, localAddresses6, false, update)
 			if err != nil {