store window size on Linux

lib/main-window.js

@@ -61,8 +61,12 @@ if (process.platform !== 'linux' || process.env.DESKTOP_SESSION === 'cinnamon')
     mainWindow.removeAllListeners()
   })
 } else {
+  mainWindow.on('close', function () {
+    storeWindowSize()
+  })
+
   app.on('window-all-closed', function () {
-    quitApp()
+    app.quit()
   })
 }