Show desktop app window frame with default window buttons (#335)

The problem lies in titleBarStyle property that was set to 'hidden'.

More info: https://www.electronjs.org/docs/latest/tutorial
/window-customization#apply-custom-title-bar-styles-macos-windows

desktop/window.ts

@@ -12,7 +12,6 @@ export function createWindow() {
     show: false,
     // alwaysOnTop: true,
     autoHideMenuBar: true,
-    titleBarStyle: 'hidden',
     ...(process.platform === 'linux' ? { icon } : {}),
     webPreferences: {
       preload: join(__dirname, 'preload', 'index.js'),