luci-app-ssr-plus: Add WireGuard kernelMode reserved keepalive …

…`allowedips` argument

*** whether to use the virtual NIC TUN of the Linux kernel！Virtual NIC TUN of Linux kernel can be used only when system supports and have root permission.
Some routes cannot be connected if they are used.

*** Current Wireguard protocol outbound Is not supported streamSettings.

luci-app-ssr-plus/root/usr/share/shadowsocksr/gen_config.lua

@@ -73,7 +73,7 @@ function wireguard()
 				publicKey = server.peer_pubkey,
 				preSharedKey = server.preshared_key,
 				endpoint = server.server .. ":" .. server.server_port,
-				keepAlive = tonumber(server.keepalive),
+				keepAlive = tonumber(server.heartbeat),
 				allowedIPs = (server.allowedips) or nil,
 			}
 		},