Revert "Use websocket bidirectionally"

This reverts commit 7316369.

Author: Brutus5000

src/main/kotlin/com/faforever/userservice/AppConfig.kt

@@ -1,16 +1,13 @@
 package com.faforever.userservice
 
 import com.vaadin.flow.component.page.AppShellConfigurator
-import com.vaadin.flow.component.page.Push
-import com.vaadin.flow.shared.ui.Transport
 import com.vaadin.flow.theme.Theme
 import io.quarkus.runtime.StartupEvent
 import jakarta.enterprise.context.ApplicationScoped
 import jakarta.enterprise.event.Observes
 
 @Theme("faforever")
 @ApplicationScoped
-@Push(transport = Transport.WEBSOCKET)
 class AppConfig : AppShellConfigurator {
     fun onStart(@Observes event: StartupEvent) {
         System.setProperty("vaadin.copilot.enable", "false")