Maint: configuration Openvpn selection structure

- Move network protocol from ServerSelection to OpenVPNSelection child
- Move PIA encryption preset from ServerSelection to OpenVPNSelection child
- Move custom port from ServerSelection to OpenVPNSelection child

internal/provider/fastestvpn/connection.go

@@ -11,7 +11,7 @@ func (f *Fastestvpn) GetOpenVPNConnection(selection configuration.ServerSelectio
 	connection models.OpenVPNConnection, err error) {
 	const port = 4443
 	protocol := constants.UDP
-	if selection.TCP {
+	if selection.OpenVPN.TCP {
 		protocol = constants.TCP
 	}
 

internal/provider/fastestvpn/filter.go

@@ -13,8 +13,8 @@ func (f *Fastestvpn) filterServers(selection configuration.ServerSelection) (
 		case
 			utils.FilterByPossibilities(server.Country, selection.Countries),
 			utils.FilterByPossibilities(server.Hostname, selection.Hostnames),
-			selection.TCP && !server.TCP,
-			!selection.TCP && !server.UDP:
+			selection.OpenVPN.TCP && !server.TCP,
+			!selection.OpenVPN.TCP && !server.UDP:
 		default:
 			servers = append(servers, server)
 		}