Ticket #459 : Fix URL parameters for functions not taken into account (#460)

Author: LazyDridri

addons/godot-firebase/functions/functions.gd

@@ -77,13 +77,14 @@ func execute(function: String, method: int, params: Dictionary = {}, body: Dicti
 	function_task._method = method
 
 	var url : String = _base_url + ("/" if not _base_url.ends_with("/") else "") + function
-	function_task._url = url
 
 	if not params.is_empty():
 		url += "?"
 		for key in params.keys():
 			url += key + "=" + params[key] + "&"
 
+	function_task._url = url
+	
 	if not body.is_empty():
 		function_task._fields = JSON.stringify(body)