Ensure local client is destroyed before we fork the server to background

The recent change that introduced defered client deletion made the local
client destruction happens too late, putting the terminal in a bad state
when we resumed the process as client only.

src/main.cc

@@ -606,6 +606,7 @@ int run_server(StringView session, StringView init_command,
                 String selections = selection_list_to_string(local_client->context().selections());
 
                 ClientManager::instance().remove_client(*local_client, true);
+                client_manager.clear_client_trash();
                 convert_to_client_pending = false;
 
                 if (fork_server_to_background())