Centralize menu button coordinate logic and replace popupwindows with dropdownmenu.

modules/menus/dashboard/index.js

@@ -1,4 +1,4 @@
-import PopupWindow from "../PopupWindow.js";
+import DropdownMenu from "../DropdownMenu.js";
 import { Profile } from "./profile/index.js";
 import { Shortcuts } from "./shortcuts/index.js";
 import { Controls } from "./controls/index.js";
@@ -6,11 +6,9 @@ import { Stats } from "./stats/index.js";
 import { Directories } from "./directories/index.js";
 
 export default () => {
-  return PopupWindow({
+  return DropdownMenu({
     name: "dashboardmenu",
-    visible: false,
     transition: "crossfade",
-    layout: "top-left",
     child: Widget.Box({
       class_name: "dashboard-menu-content",
       css: "padding: 1px; margin: -1px;",