Set StartupWMClass to package name instead of product name

Author: jamezrin

electron-builder.js

@@ -56,6 +56,7 @@ module.exports = {
     mimeTypes: ['x-scheme-handler/notion'],
     desktop: {
       StartupNotify: 'true',
+      StartupWMClass: editionEnvVar === 'vanilla' ? 'notion-app' : 'notion-app-enhanced'
     },
     target: ['AppImage', 'deb', 'rpm', 'pacman', 'zip'],
   },