Remove comma from generated penpal methods which don't have args in form

main.go

@@ -123,7 +123,13 @@ func buildViamAPI() string {
 				}
 			}
 
-			result += "ViamAPI.prototype." + packageStr + strings.Title(methodStr) + " = function(config, " + args + ") {\n" +
+			lastComma := ","
+
+			if args == "" {
+				lastComma = ""
+			}
+
+			result += "ViamAPI.prototype." + packageStr + strings.Title(methodStr) + " = function(config" + lastComma + args + ") {\n" +
 				"    return axios.post(window.API_HOST + '" + packageStr + "/" + methodStr + "', {\n"
 
 			for i := 0; i < lenFields; i++ {