Remove --gtk-version=3 workaround as no longer needed

Author: GarboMuffin

src-main/index.js

@@ -38,11 +38,6 @@ if (!settings.hardwareAcceleration) {
   app.commandLine.appendSwitch('enable-unsafe-swiftshader');
 }
 
-// Workaround for https://github.com/electron/electron/issues/46538
-if (process.platform === 'linux') {
-  app.commandLine.appendSwitch('gtk-version', '3');
-}
-
 app.on('session-created', (session) => {
   // Permission requests are delegated to AbstractWindow