Update MenuFlags to work as expected

* 'popParent' has been removed
* 'noHistory' now works as expected
* Mods that explicitly want noHistory can state such in their constructor()

core/file_base_download_manager.js

@@ -2,10 +2,8 @@
 'use strict';
 
 //  ENiGMA½
-const MenuModule = require('./menu_module.js').MenuModule;
-const ViewController = require('./view_controller.js').ViewController;
+const { MenuModule, MenuFlags } = require('./menu_module.js');
 const DownloadQueue = require('./download_queue.js');
-const theme = require('./theme.js');
 const ansi = require('./ansi_term.js');
 const Errors = require('./enig_error.js').Errors;
 const FileAreaWeb = require('./file_area_web.js');
@@ -38,6 +36,8 @@ exports.getModule = class FileBaseDownloadQueueManager extends MenuModule {
     constructor(options) {
         super(options);
 
+        this.setMergedFlag(MenuFlags.NoHistory);
+
         this.dlQueue = new DownloadQueue(this.client);
 
         if (_.has(options, 'lastMenuResult.sentFileIds')) {