Add support for proxy_protocol in proxy_hosts and streams

Closes #1114
Related To #1882
Related To #3537
Related To #3618

Co-authored-by: jwklijnsma <janwiebe@janwiebe.eu>
Co-authored-by: SBado <16034687+SBado@users.noreply.github.com>

backend/models/proxy_host.js

@@ -21,6 +21,7 @@ const boolFields = [
 	'enabled',
 	'hsts_enabled',
 	'hsts_subdomains',
+	'proxy_protocol_enabled',
 ];
 
 class ProxyHost extends Model {

backend/models/stream.js

@@ -13,6 +13,7 @@ const boolFields = [
 	'is_deleted',
 	'tcp_forwarding',
 	'udp_forwarding',
+	'proxy_protocol_enabled',
 ];
 
 class Stream extends Model {