luci-app-openvpn: Updates proto and mssfix params

- proto parameter is available in client or server mode in the network section.
- mssfix default value is set to openvpn.org default value

Signed-off-by: Philippe Duveau <philippe.duveau@free.fr>

applications/luci-app-openvpn/luasrc/model/cbi/openvpn-advanced.lua

@@ -187,6 +187,10 @@ local knownParams = {
 			"rport",
 			1194,
 			translate("TCP/UDP port # for remote (default=1194)") },
+		{ ListValue,
+			"proto",
+			{ "udp", "tcp-client", "tcp-server" },
+			translate("Use protocol") },
 		{ Flag,
 			"float",
 			0,
@@ -283,7 +287,7 @@ local knownParams = {
 			{ proto="udp" } },
 		{ Value,
 			"mssfix",
-			1500,
+			1450,
 			translate("Set upper bound on TCP MSS"),
 			{ proto="udp" } },
 		{ Value,
@@ -508,11 +512,6 @@ local knownParams = {
 			0,
 			translate("Randomly choose remote server"),
 			{ client="1" } },
-		{ ListValue,
-			"proto",
-			{ "udp", "tcp-client", "tcp-server" },
-			translate("Use protocol"),
-			{ client="1" } },
 		{ Value,
 			"connect_retry",
 			5,