Merge branch '5780-can-t-change-directives-snippes' into 'develop'

Resolve "Can't change Directives Snippes"

Closes #5780

See merge request ispconfig/ispconfig3!1226

interface/lib/classes/validate_server_directive_snippets.inc.php

@@ -42,10 +42,11 @@ class validate_server_directive_snippets {
 
 	function validate_snippet($field_name, $field_value, $validator) {
 		global $app;
-        $type=(isset($app->remoting_lib->dataRecord['type']))?$app->remoting_lib->dataRecord['type']:$_POST['type'];
+        $id = (isset($app->remoting_lib->dataRecord['directive_snippets_id']))?$app->remoting_lib->dataRecord['directive_snippets_id']:$_POST['id'];
+		$type=(isset($app->remoting_lib->dataRecord['type']))?$app->remoting_lib->dataRecord['type']:$_POST['type'];
         $types = array('apache','nginx','php','proxy');
         if(!in_array($type,$types)) return $this->get_error('directive_snippets_invalid_type');
-		$check = $app->db->queryAllRecords('SELECT * FROM directive_snippets WHERE name = ? AND type = ?', $field_value, $type);
+		$check = $app->db->queryAllRecords('SELECT * FROM directive_snippets WHERE name = ? AND type = ? AND directive_snippets_id != ?', $field_value, $type, $id);
 		if(!empty($check)) return $this->get_error('directive_snippets_name_error_unique');
 	}