adjusted Nginx TLS 1.3 naming and switched to true if TLS 1.3 is supported

Author: ms217

server/conf/nginx_vhost.conf.master

@@ -19,7 +19,7 @@ server {
 </tmpl_if>
 </tmpl_if>
 
-<tmpl_if name='tls13_available' op='>=' value='1.1.1' format='version'>
+<tmpl_if name='tls1.3_supported' op='==' value='y'>
 <tmpl_var name="ssl_protocols">
 	ssl_protocols TLSv1.3 TLSv1.2;
 <tmpl_else>

server/plugins-available/nginx_plugin.inc.php

@@ -1621,7 +1621,7 @@ function update($event_name, $data) {
 		// set logging variable
 		$vhost_data['logging'] = $web_config['logging'];
 
-                // Provide TLS 1.3 support if Nginx is >= 1.13.0 and when it was linked against OpenSSL(>=1.1.1) at build time.
+                // Provide TLS 1.3 support if Nginx version is >= 1.13.0 and when it was linked against OpenSSL(>=1.1.1) at build time.
 		$output = $app->system->exec_safe('nginx -V 2>&1');
 
 		if(preg_match('/built with OpenSSL\s*(\d+)(\.(\d+)(\.(\d+))*)?(\D|$)/i', $output[0], $matches)) {
@@ -1630,7 +1630,7 @@ function update($event_name, $data) {
 
 		if((version_compare($app->system->getnginxversion(true), '1.13.0', '>=') && version_compare($nginx_openssl_ver, '1.1.1', '>='))) {
 			$app->log('Enable TLS 1.3 for: '.$domain, LOGLEVEL_DEBUG);
-			$vhost_data['tls13_available'] = $nginx_openssl_ver;
+			$vhost_data['tls1.3_supported'] = 'y';
 		}
 
 		$tpl->setVar($vhost_data);