Add always on top flag

I don’t actually know, whether that does anything in kiosk mode but it didn’t hurt in testing.

main.js

@@ -33,6 +33,7 @@ function createMainWindow() {
         icon: 'images/icon-512.png',
         autoHideMenuBar: true,
         kiosk: true,
+        alwaysOnTop: true,
         webPreferences: {
             preload: path.join(__dirname, 'js/preload.js'),
             webSecurity: false,
@@ -86,7 +87,9 @@ function createMenu() {
             {
                 label: 'Toggle Fullscreen',
                 accelerator: isMac ? 'Cmd+F' : 'Ctrl+F',
-                click: () => { win.setKiosk(!win.kiosk); }
+                click: () => {
+                    win.setKiosk(!win.kiosk);
+                }
             },
             { role: 'reload' },
             { role: 'quit' },