firewall: Fix colouring when IPsec VPN subnets are denoted in CIDR.

html/cgi-bin/firewall.cgi

@@ -1351,6 +1351,7 @@ sub getcolor
 			#Check if IP is part of a IPsec N2N network
 			foreach my $key (sort keys %ipsecconf){
 				my ($a,$b) = split("/",$ipsecconf{$key}[11]);
+				$b=&General::iporsubtodec($b);
 				if (&General::IpInSubnet($c,$a,$b)){
 					$tdcolor="style='background-color: $Header::colourvpn;color:white;'";
 					return;